I'd suggest trying meditation if you haven't yet. It's amazing for learning to manage your thoughts and choose how to spend your energy and time.

I always feel great after spending time in groups doing something I'm interested in, like attending a concert, mechanical keyboard meetup, or makerspace class. It feels vindicating (not sure if that's the right word) to know that there are people out there like me, and there's always people who are even deeper into a hobby than I am.