Oh the lovely SI Joint
This sucks, I remembered when mine clicked back in to place, it was great.
You need to stretch the shit out of your hips and legs. Quads, hams,adductors, abductors, glutes, hip flexors.
You have to strengthen obliques, transverse abdominus, ql, glutes.
My SI dysfunction was from a car accident and weak muscles on one side of my body and strong tight muscles on the other.
Stretch out every day and do rehab exercises for the muscles I mentioned above.