Can you recommend me something from my library?

QUBE

Can't check 1600+ games. So I just scrolled randomly hoping something catches my eye. And found
https://store.steampowered.com/app/317400/Portal_Stories_Mel/
Bit surprised that you haven't played the other Portal games though. So not sure if you are even a fan of the series. But I thought this fan game was as well made as the official games, although the difficulty curve was a bit wonky. You really should try the Valve games too if you can someday.

Amnesia: The Dark Descent

From what you have untouched there:
Probably you have tried "Sid Meier's Pirates!" before?
This War of Mine?
X-COM: UFO Defense?
We Happy Few?
Immortal Redneck?

Have you finished Metro: Last Light Redux yet? I see you got around 4 hours into the game. It's around the same length as Metro 2033 Redux, which should be ~11 hours.

Crypt of the NecroDancer is also really fun, not sure how fare you got in there since you did play it for 8 hours.

I don't really see anything else that you can play that I reccomend or know of.

Dungeons & Dragons Online (DDO)

Build your character how you like. Play how you like. Helpful players in game. :)

Prototype 2, cool Action game

Viking Battle for Asgard

Based on the games I've played and depending on how you feel, I'd go for Spec Ops: The Line or Just Cause 2. One fairly short structured game with a story, the other open world that you can dip into and have a lot more freedom, both good though.

Victor Vran ARPG
Risen
Overlord
Costume Quest 2
Prototype 2
F1 Race Stars
Puzzle Agent 1 & 2
F.E.A.R. 2: Project Origin
Hero of the Kingdom II
Shiftlings

I also really liked AR-K, but you probably won't. ;)
This does not meet your criteria of "straight to the point," but Submerged is fantastic, IMO.

Or you could play Syberia II, which you won from me! :D Although it doesn't meet your criteria either

GRID, the original one which was previously known as "Race Driver: GRID". Simcade racer with a good amount of detail in it.
Despite it's age, it's still pretty decent and don't forget to pick up the 8-ball and prestige dlc from unofficial patches and perhaps even remove the famous baked screen filter of the era.

I see you liked (or at least played) Life is Strange (my favorite!). It's supposed to be fairly similar to The Walking Dead, although I haven't quite gotten to it yet, either.

Both are short and pretty good that I played before and you have 0 hours in them.
Eternal Senia is a solid action JRPG.
Evo explores is a fun puzzle game.

Faerie Solitaire is pretty good, assuming you actually like solitaire, otherwise I'd seriously suggest Psychonauts, it's definitely one of Double Fine's best.

Armello, great board game

I see you're a man of taste to have an OMAM quote on your profile :P

Some games I'd recommend:
L.A. Noire is a nice option made by Rockstar since GTAV is among your most played. It certainly has the feel of a Rockstar game however it runs kinda opposite to GTA, in the sense that L.A. Noire is emphasising on the story aspect with action segments spread around instead of the other way around.

The Last Remnant is an okay choice if you're in the mood for something turn-based RPG-ish although the plot certainly is rather subpar. Mechanically though it offers a rather unique experience with its battle system.

Alpha Protocol for a stealth game(or a run in guns blazing game if you prefer to go about it that way) where choices do matter. it is said to have quite a few bugs but I've played about 70-75% of it so far and haven't run into any gamebreaking ones myself.

And ofc Borderlands for a FPS.

I highly recommend Alpha Protocol. It's a solid stealth game with a well done choices and consequences system. There are some forced shootouts which sucks, but most of the game is stealth and it's really satisfying.
In case you don't enjoy stealth, you can take the action-oriented approach as well, the game lets you do that.

Edit: Also, give Draw Slasher a try. It's a fun, nicely drawn game where you are a ninja and have to fight various enemies using your mouse.

When I don't know what to play, I go with something short or something with easy achievements.

Apogee and 3D Realms games are reasonably short and enjoyable.

Planets of War is pretty bad but it's short with easy achievements.
Strangers of the Power is mediocre but easy, but you can't get 2 of the achievements without DLC.
Morotrama is an average racing game with easy achievements,
Simple Story: Alex is pretty bad but it's a half hour long game with easy achievements.

If you want something that's full length and don't care about achievements one way or another there's Bioshock 2, Sid Meier's Pirates, FEAR, Civ 3, GalCiv 2, Realms of the Haunting and a bunch of Tomb Raider games.

1. X-COM: UFO Defense
   Good but a little outdated. the new ones are better.
2. Tomb Raider: Anniversary, Legend, Underworld
3. Serena
   Has a good story to tell. It's short: 3 hrs max.
4. Realms of the Haunting
   a FPS, FMV game with a interesting story.
5. Q.U.B.E.
   Good puzzle game
6. Metro 2033
   Redux version are better, but this one have a great atmosphere.
7. Just Cause 2
   Cool open-world game
8. F.E.A.R.
   Fast-paced brutal horror FPS
9. BioShock 2
10. Binary Domain
    an Underrated third person shooter, good story and characters, 9 hrs play time.
11. Amnesia: The Dark Descent
    One of the best horror game
12. Alpha Protocol
    Obsidian's underrated game, A pretty good espionage RPG game with a branching story. 11 hrs play time.
13. Devil Daggers
    No story this time! the only goal of this game is to survive, and i must admit, it's pretty addicting:)
14. LEGO® Batman™: The Videogame
    Enjoyable
15. PROTOTYPE 2
16. Downwell
    Endless game, good for short breaks from realty.
17. Spec Ops: The Line
    Amazing story. one of the must play.
18. The Stanley Parable
    Pretty funny game. The updated version, Ultra Deluxe, will come out this year with new endings and stuff.
19. Jotun: Valhalla Edition
    Hardcore boss rush game. 5 hrs for me.
20. There Came an Echo
    Never played but i heard it's good.
21. Shadowrun Returns
    Good game, it has a predictable story but good narrative. 21 hrs for me.

Sorry for the wall of text:)

It's hard to tell what you actually like playing since your playtime indicates you've been farming cards. I also see you've got a TON of f2p MMOs in your library and I would highly recommend giving Mabinogi a shot. Once you get past the tutorial and figure out how the game works... I think you might get into it. I know I did!

Metro 2033 and Puzzle Agent series caught my eye...

Giana Sisters: Twisted Dreams if you feel like playing a fun and colorful (and reasonably challenging) platformer.

Just Cause 2 if you wanna blow stuff up in an open-world game with a ridiculously huge map (you don't need to have played Just Cause 1 to play it).

Psychonauts for a really fun and quirky 3D platformer.

And... that's it. You've already played (to at least some extend) anything else I'd personally recommend. ^_^'

Hi I can reccomend for you Samsara Room, it is very short "point'n'click" game (about 1,5h) and it's free to play but it's amazing because of it's ambience. If you like it you can try rest of the Rusty Lake game series. Some of the games are free too (Cube Escape for Android phones, maybe for IOS too, idk) or very cheap to buy.
You should definetly give it a try, especially because it is very good, free and short game. :)

I recommend using https://www.lorenzostanco.com/lab/steam/u/sadwichito. Sorts all your games by quality, you can use all kind of filters and if you still can't make up your mind, let it pick a game by random chance for you.

The site recommended Deadly Premonition for you. Neat game, played it myself.

Adventure Capitalist is good for mindlessly killing brain cells. I've heard the Duke Nukem series are pretty good, you could always Invite the Dwarves to Dinner, I played a bit of Lead and Gold, and it was amazing (Didn't get into it too much due to shoddy internet), and finally, Lego games, be it the Hobbit or LoTR are always fun... These more so, because they're based off wonderful pieces of fiction.

E: Spelling, deletion of extra spaces.