I feel your pain. I myself have noticed this when shooting longer distances: don't change your form! In other words, keep the same form, the same anchor,the same cant, the same everything that you would use at 10 or 15 yards. Just aim slightly higher, depending on the distance. Once you get the trajectory down, longer distances won't be so intimidating. At this point in my shooting, I have three distances. Keep in mind I use a 45# longbow with cedar arrows, but only pull about 40#.
Here are my three distances:
15 yards and under = cakewalk. Guaranteed no adjustments, every shot in the vitals. Aim center mass of the vitals.
20 yards = aim slightly higher, maybe at the spine area of a deer target. About six or eight inches high in other words.
25 yards = aim about a foot over the spine, or about 18 inches higher than normal.
25 yards is as far as I will ever shoot, period with my bow, under perfect conditions. Eventually I will move out to 30 or 35 yards, just for fun because shooting long distances is a blast, and makes close in shots that much easier.