I read a comment on hacker news that I cannot find now, but it resonated deeply with me. Don't try to answer the question "what do you want to be?", answer the question "what do you want to do?" I answered the wrong question, I said "I want to be a musician". And what I did was teach music I didn't care for, perform music I didn't care for, work for people and gigs I didn't care for, made a salary I didn't care for.…
In your case the impact might be something like "to inspire others who hear the music I play". Or it might simply be "to increase my own wellbeing by taking joy through playing."
After all, there must be some underlying reason why music is important to you. So this framing can help unearth that and thus allow you to focus your efforts on those goals.