I don't have any tips unfortunately. My therapist suggested that I try new hobbies to develop my sense of self. I've picked up a few, but I have little connection to them. I haven't stopped trying to get more into the current ones and also find better ones ofc.
I suspect that even with hobbies, I will still have little sense of what I want, how I'd like to be perceived, what I believe, etc. I think hobbies might be a good start though.
I'd really like to know what has helped you get to know yourself/develop your identity.