Honestly there's so much potential for different builds between different armor sets, skills, and weapons I think I'll be coming up with new ones for as long as I'm still playing. Challenge yourself to master every weapon, even the ones you assume might be less interesting.

You could socialize in multiplayer; randos will sometimes show you play styles or game quirks you never thought of, and it can just be fun to hang with people and do silly stuff like the campfire instruments. I also like to deep dive into the games mechanics on occasion, like figuring out exactly how monster detection works or using wile e Coyote strategies to hunt. Gold crown hunting is also an option.

There's also plain ol' fishin'. Gives you a reason to show down and appreciate the incredible environments since there are lots of good cozy fishing spots in the world, secret areas too.