My initial thought was something like Elder Scrolls or Fallout, but I think I would be happier in something with a robust building system. Minecraft would work but something like 7 Days to Die would work too and add a bit more challenge. Maybe Valheim, I haven’t played a lot of that but the building system seemed good the little I played?
Edit: I think I would choose No Man’s Sky, actually. Endless exploration and a semi decent building system.
I’ve been cheating since the days of hand writing them from the internet for snes games. Once it gets boring, fuck it. But wholeheartedly, DO NOT CHEAT IN MULTIPLAYER. There’s just no reason, either you like playing or you don’t. I’m trash at Siege, but I still play without hacks cuz I still find it fun even when I lose.