I still play SimCity sometimes. The SNES version. There’s something beautiful on slowly building your city, solving problems that arrive, and when you’re don… oh wait you’re never done! (Not even with the Mario statue.)
More into colony sim territory: Oxygen not Included, Dwarf Fortress, RimWorld. In special I’ve been playing the later quite a bit (1.4 version, up to Biotech), selectively breeding colonists to get superpawns.