Which hip is more limited and what to do about it.

Determining the limited side.

https://www.youtube.com/watch?v=uj2C2liq7_Y

Help the joint while stretching laterally into the limited side.  Take care to make sure you sit into/stretch into the limited side THE SAME as how your body does the flexible side.  Meaning, take care to avoid twisting cheats or rotational cheats that may fool you into thinking you've gained the motion.

https://www.youtube.com/watch?v=wSIrLzBTrEQ

Same as above.  Take care to avoid swiveling at the booty, knees, ankles to fool you into thinking you're stretching into the limitation.  Check the flexible side to make sure you're mimicking the motion properly.

Restoring long lost hip joint mobility takes time as much as it takes the steady altering of your movement patterns to begin to incorporate your gains as you shift away from the movement patterns that keep you injured/hurting.  Part of that pattern change is learning how to squat/sit into the limited side again in situations such as: sitting, sit to stand to sit, squats, lunges, dead lifts, driving, etc.  If not, you return to over-pivoting through your flexible hip (leading to impingement and loss of motion) and re-tightening your limited hip (leading to loss of hip motion and impingement) -- either side will/can develop ITBand syndome, bursitis, patellofemoral tracking issues, piriformis syndrome, etc. Best physical therapy practice involves determining limited joint mechanics, restoring those mechanics, and then educating on how to keep using what's gained while avoiding return to movements that invite your issues to return -- that is the true journey to stop chronic pain.