Advice on PRP et al for SI joints

For the past several years, I've dealt with chronic SI joint inflammation. When I'm in a "good" phase, they are never truly at zero, but it's fine. I always have to be careful, though, and I spent a lot of time with the theragun on them at the end of the day - particularly if I did something strenuous. I'm resigned to this just being life from now on. It sucks, because it limits my ability to do simple things like go on a long hike.

But sometimes, they flare up - seemingly randomly - and really impact my ability to do things (e.g. sitting in a car is almost the single worst thing for them). I usually go see a dry needler and that seems to often help - particularly with the acute inflammation.

But I'm wondering now (in the middle of a particularly capricious flare up) if I shouldn't seek some more long-term relief. Is PRP a thing for this? Anything else? TIA