Here are two simple thoughts to pivot better. Get into your setup position, flexing your knees so your knees are over your big toes. This will make a house from the base of your crotch, down to your knees, and your feet. As you bring your club to the top of your backswing, you will feel like you are making a teepee. As you start your downswing, make the house again, and when you swing through, back to the teepee.
Forming houses and teepees with your stance throughout your swing will help you pivot better and hit some better shots.