I don’t like to use the term “Hitting Down” on the ball. Other issues could come out of that. I say, hit through the ball with a steeper angle of attack. Many times I can achieve this using a visual of hammering a nail through the ball. Keeping your eye sight slightly ahead of the ball. I would also place a tee an inch or two in front of the ball (left side of the ball for a right handed golfer) and have the golfer focus on hitting the tee, or popping it our of the ground. Look at the attached YouTube video for the “Nail Visual.”