League of Legends
Patient Gamers
A gaming community free from the hype and oversaturation of current releases, catering to gamers who wait at least 12 months after release to play a game. Whether it's price, waiting for bugs/issues to be patched, DLC to be released, don't meet the system requirements, or just haven't had the time to keep up with the latest releases.
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Daggerfall Unity fits this almost perfectly. You can become hilariously OP if you want to, but exercising some self-restraint on the custom class and enchantment screens can lead to a very challenging experience.
Running with Rifles, Ravenfield, Arma/Operation Flashpoint, Foxhole, This War of Mine, Kingdom Come Deliverance, Intravenous, Rimworld etc are ones I can think of. I hope you find what you're looking for!
Star citizen
try Champions of Regnum. Easily 20+v20+v20+ RvR open pvp. You do feel somewhat like a small cog in a big war machine, but with still opportunity to shine if you can perceive it.
you've gotten a lot of replies already - but I'd say in terms of feeling disempowered, fear & hunger or pathologic is great. great way to experience gruelling and cruel worlds.
You perfectly describe Rain World!
You’re a small and insignificant creature in a dangerous and unforgiving ecosystem. You’re not saving the world. Even the enemies are playing by the rules. Evading enemies is often the safest option, but sometimes you must do a risky confrontation. It’s rare you even take down an enemy at all. Deaths are punishing. It’s open world, but the random placement of enemies often dictate the path you’re taking.
It has also one of the most intricate AI systems in any game. There’s YouTube videos describing it in detail, but I recommend to not watch them and go into the game clean.
Kenshi
Dyson sphere and satisfactory. You are just a cog in a very large piece of machinery.