I found a website that has a pile of (what I believe to be) good information, and encouragement.

I'm not expert on SI joint treatment, but I've found the site to be helpful... Perhaps it can be helpful for you, also?
https://sijointsaga.com/
(I'm NOT affiliated with the website)

I'm also reading "The Way Out..." by Alan Gordon, for the 2nd. time - I'm currently pursuing a "Pain Reduction Therapy" (PRT) therapist... what the book touts.

Using the brains neural plasticity... the ability to re-wire the brain, to react differently to nerve pain signals seems to be, at the very least, a way to reintroduce my body to my brain as something other than "the enemy".

- it's a journey, for sure!