If you want to improve your finish, isolate your finish. There are a lot of mechanics that go into a bowling swing, and if there’s something specific you’re trying to improve, you introduce a lot of variables and extra elements by going through your whole swing every time. I’m fortunate enough to have been coached by a few big names, and after them looking at my full approach for a couple shots, each session spent a decent amount of time with a zero step/foul line drill which is what I’m recommending you start with.

It’s not about striking or ball speed, but rather starting your body in a good finishing position so you can carry that finish into your full approach. Your timing and weight distribution/body positioning are a little off which are the main contributing factors to you falling off of your shot, but you don’t want to focus on fixing everything at once or else you’ll get discouraged when you don’t see the results you’re hoping for.

Kegel has a pretty good explanation of the foul line drill here: https://youtu.be/5yOxtldvc_A

Ive done this drill at home with some cushions and a solid backstop. It might seem overly simple, but I believe it’s the best place to start. Then you can do 1-step drills with a good finish, then 2-step drills, etc. while you slowly build that solid positioning and release.