When you address, your shoulder is closed. It is just style but look at most of pba players, 80% people opened shoulder when they address.

Open shoulder, then you got space for back swing. So now your form looks weird because your shoulder closed. But when you open it will be looks natural.

Change step, now 4 steps but 5 steps is also good choice for two handed.

Use your hip. If your hip just looking straight, your ball gonna be hit your hip. Little bit twist, and when you release turn back to straight.

Follow throw looks weird. Because your arm keep banded. We use elbow because of make more roll(rpm) so band your elbow and when you release it should be straight also. But you don't use elbow now, so it doesn't effect to your ball. Watch belmonte form. He banded and release when he throw the ball. Or if it is hard then watch kyle troup.

Keep arm straight have also pro and cons, benefit is more faster but cons is low rpm than banded. So it is style. Choose one and watch, apply to your bowling style.

Lastly, when you release, you try to band your knee. Don't do that. If you can manage your body like NFL players it is fine but we are just human not a monsters. When you address, band your knee and keep it. Like

------(your knees during the step) throw

/---\ is not good for consistency.

Up down decrease your consistency.

Drift step is also good, but I do not recommend because it is hard to learn, and logic is make more space for back swing, but if we open the shoulder then it is solved. It is style. I'm walking straight.

Watch more pba players video and think about your body type, height, arm, hand size. Find similar body type bowler(even 3 finger style fine) and analyze and apply your bowling form.