I mean my personal preference is FPS stuff but you can just do whatever! Anything that's fun
Like I really want to try Stellaris or Civilization some time but that's a big undertaking and I understand not everyone has the time or energy or dedication for that, let alone myself. So it's just whatever sounds good and works! But yeah I'll spin up game servers for old Half-Life mods that haven't been played by anyone in years. It's pretty fun.