That’s the first thing I noticed, too.My gosh that's a tiny bow. That could be the problem. A longer ATA bow will be much more stable, and much easier to shoot.
When I previously stated that you can’t buy accuracy and improvement, I should have stated that you can buy improvement if what you’re currently shooting is not a good fit or you have the wrong equipment. As 5milesBack mentioned, a longer ATA bow will provide you with a much better platform for stability and string angle.
I can’t tell enough from the video to give you some pointers, and even then - I’m not a coach and would hedge on telling you what to correct.
Besides coaching, I would advise anyone to buy from a archery specific pro shop with staff that will invest the time with you to make sure you’re getting a bow that gives you the ability to shoot with the correct form. Big box stores almost never will have the staff that can get you set up correctly, and trying to save a few bucks on a sale bow (unless you know what you need) can cost more money in the long run because you’re going to find out your equipment is limiting you. It’s essentially like buying a shoe that is too big or too small…
You will probably be able to shoot the current bow you have with more stability after you get stronger, but again, it’s short. I would go back to the store you got that bow from and mention the stability issue you want to correct and ask them about the benefits of a longer ATA bow. If the store says the bow they sold you is fine, or doesn’t want to try and help you, I certainly wouldn’t be getting any more coaching from them on your shot because they are probably only a little more knowledgable about archery as you are, or just wanted to make a sale on bow that isn’t a good platform for you.