Check arrow weight. If your arrows are too light, and others too heavy, it is almost impossible to get a good grouping.
Also, keep shooting. Watch your anchor. I anchor with my middle finger on my teeth, between the vampire tooth and the one behind it. If you vary too much up and down, that will affect elevation.
Practice until you get stronger. Make stronger, faster bows. The faster the bow, the less you have to deal with elevation, unless you are shooting long range shots.
Also practice.
When you done practicing, I would advice practicing some more.
And more practice.