One of the most difficult things for me to overcome has been judging distance for elevation. I came up with an exercise that has really helped me with this.
I start 5 paces from my target bag, and shoot, then I walk 5 long paces and shoot again, then 5 more long paces and shoot, I continue this until I've shot 7 arrows. Then I take five long paces back toward the target shoot, take 5 paces, shoot, and continue until I've shot 12 times and am back at the orginal 5 paces.
On alternating evenings I do the same exercise using 7 paces.
These two sequences give me 30 yard and 42 yard range. I think of it like walking the arrows in to the target, but not from a single distance.
Just to mix things up, I sometimes shoot the moving away shots as a quick turn, snap shot with the bag on the ground, imagining my 4 inch dot is a brain shot on a pig.
I'm no Robin Hood, but I'm killing a pie plate consistently inside 40 yards now.