Those would be the extremely moddable games with a good all around base set for replayability, so for me:

• Rimworld
• Mount&Blade bannerlord
• Crusader Kings 3
• Civ 6
• Luanti (and if have to choose a single game for it, Mineclonia I suppose)

As long as I can also archive some amount and variety of mods for each, of course.

If mods aren’t on the table, I think it would still look pretty much the same, except maybe civ 5 in place of 6, and in place of luanti perhaps Witcher 3, or 4 if it manages to release before this thing.

Edit: Actually hold that a bit: I need Stellaris there, especially if mods are ok. But even without. I’d skip luanti/witcher for that.

If you do not need it, how about selling it off to someone who actually needs it…?