Tales of Maj Eyal is an oldschool turn based roguelike game that is free to play (with paid DLCs or steam edition) and should run just fine on your system. It has an adventure mode that lets you play with no punishment for dying for a more stress free experience. It also has a global in-game chat with others who are playing the game, despite it being a single player roguelike, which is kinda cool for that community aspect.
Hypnospace Outlaw is a fantastic game about exploring an alternate version of the internet as it was in the 90's, only this one is accessed via headsets when asleep. It sounds weird, but is super chill, and hits the nostalgia pretty hard. It feels like its own community all by itself!
Stellaris - Big real-time space strategy game
Dominions 5 - Fantasy turn based fantasy strategy game with tons of nations often based on real world mythology mixed with fantasy elements.
Kingdom Death: Monster - Tabletop (play on tabletop sim) game that mixes Darksouls/Monster Hunter like boss-fights with a little bit of Darkest Dungeons like colony management/attrition/madness