You've come back at a great time! There's lots of solid indie games on Steam that won't melt your laptop. I gotta recommend Hollow Knight (adventure, platformer) and RimWorld (survival, colony sim) those are probably my personal favorites.
If you like action, try Blasphemous (bloody metroidvania), Enter the Gungeon (guns guns guns), or Rogue Legacy (fast platformer).
I love turn-based stuff too, maybe try Neo Scavenger (hardcore survival) and Wildermyth (roguelike RPG).
🧠 Brain need a workout? Engage with the mysteries of: Her Story, Return of the Obra Dinn, The Stanley Parable, or The Case of the Golden Idol. I tore through a bunch of Steam mystery games a while back, and those are the ones that really stuck in my head. Enjoy!