I second the therapy suggestion! It has helped me overall, not just while riding.
I also found that having a nice little w/t/c ride in a halter on a very steady packer has been incredibly beneficial. Sounds super odd but as someone who has grown up riding hunters & dressage, the pursuit of perfection has become my demise. By plopping around the arena in a halter on a long rein, I can’t fry my brain over trying to micromanage the ride. It does require having access to a safe horse that’s comfortable doing this though! Do not recommend trying it on a greenie or anything flighty/spastic