There are several threads about one thing that has helped most, bow arm, release etc. I videoed my practice today to critique my form and thought I'd share it. This will also give my answer to a few of the other threads. Last year I tried to really focus on form. The one area that I put the most time into was bow arm. A friend convinced me that if I could master one thing it should be my bow arm. I played with all sorts of grips to find the one that absolutely kept me from interfering with the bow. For me it was to tuck all fingers and let the bow jump to target. It made a tremendous impact on my shooting. Of course it required me to use a wrist or finger sling. I even hunt with them because I have engrained this into my shooting to the point now that I will drop the bow if I don't have it on.
Now I'm working on release. I am pretty good on bale but on target sometimes I straighten the fingers on release. I am going to work a lot on that this winter. I hope this video is helpful.