A reverse pivot at times occurs because your shoulders invert in your backswing rather than rotate level relevant to your address posture. To cure this, grip your club with the head of the club at knee level and make some swings. It may help to do this in front of a mirror. It will help you to feel the plane that your shoulders should rotate on and prevent the reverse pivot.
Reminder: Someone once said that “practice makes perfect, that’s incorrect, in fact, perfect practice makes perfect.” You first need to statistically chart your golf rounds to truly understand your weakness, then organize by time percentage what areas of your game need the most attention.