Hitting a guaranteed draw every time, to get around things like a tree, is simply learning how to set up for the shot with a closed clubface, closed stance, do not turn your body too early and allow your forearms to rotate through the shot more
Coming up out of posture during the downswing is a common fault created by a lack of strength in the glutes (buttocks), try stretching and strengthening them by lying on the ground with your knees bent and lifting your hips and buttocks off the ground for ten seconds
Use this shadow drill to get your weight behind the ball and hit higher shots