LEVEL OUT YOUR TURN
I bet you’ve heard “you need to turn more” plenty of times. I won’t disappoint. You do need to turn. But the driver works the best if swung on a shallow plane. You lose that plane if you make a very steep turn, and your left shoulder dips very low on the backswing and then comes around very high. That makes the bottom of the swing steep and narrow, not flat and wide like it should be. To feel a good turn, hold a club across your chest and turn back and through with the shaft remaining roughly level with the ground. Recreate that feel when you play.