I want to play a game like Skyrim that isn't Skyrim. Recommendations?

Boundless ? no idea if any good but just noticed the extra free game on humble choice ;p

Did you play Enderal: Forgotten Stories? It's a free total conversion for Skyrim that's quite good.

Kingdom Come: Deliverance, The Witcher 3 & Red Dead Redemption 2.

Kingdom Come: Deliverance is a solid medieval open world rpg. Its more like realistic/historical medieval than fantasy, no magic or different races or monsters.

FarCry 3

https://knowyourmeme.com/memes/like-skyrim-with-guns

I haven't personally played it, but I feel The Witcher 3 would be a good comparison not only for having similar elements but also being well loved by the gaming community. Kingdom Come: Deliverance might also be worth looking into and if you do collect the free games on Epic Games Store, you probably own it.

And personally I really liked The Legend of Zelda: Breath of The Wild (haven't finished it). Only for Nintendo Wii U and Switch though. I had a hard time getting into Skyrim, but I found it relativity easy to get into BOTW. I also liked the whole climbing and gliding aspect of the game. And finally I just like the Zelda series so that probably helped. I feel like it's quite a bit different from Skyrim though, mainly that Zelda games aren't too heavy on RPG aspects and have more of a puzzle/exploration focus over questing (There are quests though).

And if you like stealth games and just to shake things up. Metal Gear Solid V might be worth looking into. I only played the prologue game (MGSV: Ground Zeroes), and I had a lots of fun. And like Zelda, i just really love the Metal gear Solid series.

Have you looked into No Man's Sky? It's gone from launch fiasco to widely appreciated.

Horizon Zero Dawn looks pretty damn sweet, IMO. Be aware it doesn't become available on Steam until August 7th.

https://store.steampowered.com/app/794260/Outward/

Dragon Age: Inquisition is a really decent open-world fantasy RPG, I had a lot of fun with it (twice); it has also recently arrived to Steam. Elex can actually be pretty enjoyable (just don't forget the mod that disables urinating sound - yes, it's really an issue in one of the locations unless you're a manly man who's ok with this stuff every couple of minutes).

Gothic 1-3
Risen 1-3
ELEX
The Witcher 3
Divinity 2: Ego Draconis
The Elder Scrolls: Online

I hear lots of good things about Kenshi though I haven't sat down to play it yet myself.

Arx Fatalis

Conan Exiles

Gothic 1-3 IMO are a must have.

A must-have for all Skyrim fans. And it's completely free. You are so welcome: https://store.steampowered.com/app/933480/Enderal_Forgotten_Stories/

horizon zero dawn is kinda sorta like that, as is kingdom come deliverance, i think?
i had tons of fun in dragon age origins ultimate

Greed Fall maybe https://store.steampowered.com/app/606880/GreedFall/ and others games already mentioned.
Middle Earth: Shadow of War

I think the Dragon’s Dogma: Dark Arisen are similar, include open world, fantasy, dragon....waiting for a new game in this series :))

Two Worlds

Ultima 7