This isn't meant to be a commercial for this specific therapeutic approach - just a suggestion made with the thought that it may be helpful to some.

I have had "tight muscles" as long as I can remember. Soon after 9/11, a massage therapist / body worker volunteered to come do chair massages for those of us working at Red Cross since in the early days we were all under stress which we initially expected to continue indefinitely. She found so many tiny spots that hurt when she touched them that I thought I needed to find out more. I've been seeing her for regular massage sessions since then, and find that her work has helped me feel better. She has modified her approach based on lessons learned through her more than 30 years in practice, but her initial training was in the approach pioneered by Paul St John.
https://www.stjohn-clarkptc.com/paul-st-john-1