I'd just recommend general hip mobility drills, especially focusing on the hip flexors, adductors, hip internal rotations, and hip external rotators.
For exercises, start with some dead bug variations so you are working on the anti-extension musculature without opposing gravity, then progress to basic prone plank holds, PUPPs (Push Up Position Plank), and bird dogs. Make sure you are not allowing your lumbar spine to sink into extension. Then attempt swiss ball roll outs and progress to ab wheel roll outs. For anti-rotational work, I would start with static palloff press, progress to dynamic palloff press, and add in chops, anti-rotation presses, etc.
Stir the pot is a great exercise, but people try to do too much with it too quickly. With both the ab wheel roll outs and stir the pot, only do the range that you can handle and progress as tolerated.