How do you guys keep entertained after finishing the game?

I really love survival games and I just finished the main story.

Got all blueprints, upgraded all weapons, built my base the way I 100% wanted it to be. Now besides surviving which at this point isn't challenging anymore even on hardest difficulty theres nothing else to do I'm getting bored even though I want to keep playing the game.

I set some "challenges" for myself like not using guns, I just fight melee even when multiple mutants are raiding, only use bow to hunt food and basically just eating and drinking what comes from the nature for example

Any ideas on what else I can do? I don't feel like replaying the whole story again lol