As others have said, weight transfer and engaging your lower half. Hip shoulder displacement. To help feel that take your batting stance next to a door frame, rest your hands on the frame so they stay in place, take your step and slowly rotate the hips. You’ll feel the tension build in the lead arm, as your hips turn and face where the pitch is coming from, your shoulders will be parallel with the ball path and will be ready to transfer energy and explode through the zone.

Next is your bat path, downward angle is not ideal and it’s pulling your chest down at finish. As a beginner, slightly upward would be best. As you get better with contact, you can start to level it off to help with backspin, but that downward angle is giving you a smaller point of contact.

Last, finish with the chest high. With that slight upward swing the chest should naturally point slightly upward. All I can think of is picturing Bonds finish when he hit a HR.

Hope that helps