Not sure if you're shooting instinctively, but if so, one routine that really helps me is to spend a few rounds staggering distances. Take a handful of arrows and shoot one from 15, then move to 20, 25, 30, etc. This really helps to train your brain when it comes to calculating and adjusting to different distances. Also, the smaller the target the better for developing your hand-eye. A tennis ball always works well.