If you’re the most experienced person in the room, leave as quickly as you can.
Being "the best” in a band/comedy group/office is an extremely dangerous position to be in. Sure, it’s nice to finally be good… It’s a trap. I don’t learn anything when I am “the best”.
Instead, try to find situations where you are at the bottom of the class. I have been dead last in a number of classes, and it’s the perfect place to be. You learn at your fastest rate when you’re dead last.
If you’re feeling comfortable where you are, you might have already become “the best” without noticing…