JB,
Here is what I see. First, I'm not sure why you want to take that step forward as you start your draw. I don't think that is a habit you want to take into the hunting field with you (if that is your plan).
Your video is taken from a poor angle to tell much, we really need a toe to toe, belly button to belly button view that shows from feet to head and bow to string elbow (ALL OF YOU). AND another one looking from behind and looking down so we can see your string forearm (elbow) to bow hand -- for alignment.
From what I can see here, you are not getting to full draw -- string hand is out in front of your face a fair distance it appears. That in turn, keeps your string forearm outside the arrow line and causes the flip of the string hand as you release. It also keeps the weight of the bow in your arm and you don't have a chance of transferring to your back -- so you get no follow through. Try thinking about "pressing" the string arm elbow and shoulder back - perpendicular to the arrow line - then release.
Your actual string release looks pretty good -- nice relaxed hand release it appears.
These are just suggestions, really need better video angles to help much more.
Arne