I like to vary my practice routines between spot targets, 3D targets, and burlap or paper animal targets. I find weekly 3D shooting to be a big help for me. Even if it’s not realistic for you to regularly shoot 3D targets, don’t fret, you can still achieve the same effect. For example, instead of shooting a target that's white-on-black or black-on-white, add in targets that are brown-on-black, or dark brown on lighter brown, and targets that vary in size or shape. Also, try making or using a target with a lot going on, that is, a target with multiple spots that are close together, targets that have writing on them, or targets with any other distracting visual variable. As you repeatedly practice picking and focusing on that one tiny spot amongst all the clutter, you will get better and better at shutting out all of the other variables that can draw your focus away from where you want the arrow to hit.