Here is a very simple drill to stop you from going over the top. Take your headcover and place it on the ground so that you can’t come over the top. This is a feedback station. This will encourage you to come a little bit more inside on the downswing. You’ll hit a little bit of a push or draw, then the ball is going to straighten up and not slice so much.
So set up normal, club is going to be inside and then back inside. You get draws every time and you have a feedback station to know if you’ve done it right or wrong.