idk what you could do but whatever it is must be good because I sank way too many hours into that, which means it did something right
perhaps a "bounty board" concept that sees dungeons reused for different, semi random means. I think skyrim did something similar with the generic "endless" quests (ie, go back to this cave you cleared ages ago, some bandits are there, or go find a trinket). in a big game like skyrim that's stupid, but in something graal small I could see it working as a justification to return to old locations