Use a long flowing swing with steady acceleration
Developing resistance on the through swing of your pitch shots is critical for control, this retraction drill will also keep your club accelerating, avoiding the biggest mistake in pitching which is a decelerating clubhead
Make a long, lazy, slow-paced swing to create a high trajectory. This gets the ball up high so that it lands softly and does not roll. It is a risky shot, so only play it once you have practiced it sufficiently.