If your ball is not launching high enough, experiment with the ball placement. Try putting it an inch or two forward from the middle of your stance. If that does not work, try putting it one to two inches in the opposite direction.
Don't chop down at the ball. You will still create backspin to give your ball loft, but your ball may only carry 10 to 20 yards. Your arms, especially your elbows, will suffer from the blow.