Medieval sim/economy/survival suggestion

Grand Ages: Medieval?
https://steamcommunity.com/app/310470/discussions/0/517142892057718836/

Life is Feudal: Your Own?
https://store.steampowered.com/app/290080/Life_is_Feudal_Your_Own/

Life is Feudal: Forest Village?
https://store.steampowered.com/app/496460/Life_is_Feudal_Forest_Village/

Maybe buy both Life is Feudal in a bundle? https://store.steampowered.com/bundle/8377/Life_is_Feudal_Franchise_Games/

Mount & Blade Warband is also a good pick.

Mount & Blade Warband does some of that.

The old DOS (maybe free by now?) game Conqueror AD 1086 has all of that to some degree (you have to manage your fiefdom in order to support your army) and is a good game.

This is not about survival but you should check if you haven't played it before:
Anno 1404 a.k.a. Dawn of Discovery

I'd suggest Banished or one of the Stronghold/Stronhold Crusader games. Anno 1404 (Dawn of Discovery in the US) is also fantastic, but might fall outside what most people consider medieval?

Saelig dev is super involved, he is alone but he makes very regular updates.
At the time of EA i tried it (1,5 year ago), we could discover most of mechanics and reach 100% achievements in 15-20h, but it was already a very polished and fun game. Since i just wait for full release before replaying it. I have absolute confidence in the seriousness of this developer.

Guild 3 i don't trust it. But i don't know how much it's improved since the horrible start of early-access. Maybe it's much better now ? I don't know.

CK2 is the best medieval survival (and murderer) sim.

So, according to the front page banner it ends at the 9th and if you click it, it says 7th, so when does it end?

I love you

https://store.steampowered.com/app/690830/Foundation/
From the discription on their storpage;
Foundation is a grid-less, sprawling medieval city building simulation with a heavy focus on organic development and monument creation.

Hmm, it's not the same sort of game at all, but have you taken a look at https://store.steampowered.com/app/233860/Kenshi/ ? I don't know how to describe it exactly... :)

stronghold crusader hd economic campaigns

Even though it doesn't tick all your requirements:
UnReal World
https://www.unrealworld.fi

The Guild 2 was pretty good, bit buggy tho.
Knights of Honor was fun, blend of RTS with some 4x stuff.
Stronghold games are solid
Banished is great and has lots of mod support

Check out First Feudal, it kinda like Rimworld.