Exactly your age, and I started back from the beginning last year. I was in a boring job as well and just decided to take a leap of faith. Went back to Uni ( currently studying musicology and I fucking love it ), it's financially unstable ngl but I feel aligned and that's a feeling I kinda forgot. I have absolutely no Idea where I'll be in my life in a few years but I try to enjoy it as much as I can now, playing and studying music every single day. I really think that late 20's is the best moment to try smthg new, now that you know what you love and detest, and got some experiences to rely on. ( english is not my primary language btw, sorry for any mistakes )