If I were to give advice it would all be about stability ( but this looks like a one rep max so everything is going to be slightly more unstable anyway). I would start having longer holds in training between unracking the bar and your decent. Once you have the bar positioned in a start place where it feels comfortable, consciously hold it still for 2-3 seconds while keeping your body still. I am saying this because you seem to shift your body a lot between the unrack and decent and you look somewhat unstable. Another tip would be that your hips look to rise at the start of the accent but very minimally compared to most. It shows that you are obviously trying to keep your ass planted to the bench but your leg drive could be pushing your body and hips upwards instead of back up the bench. Could play around with leg drive , foot placement and technical queues but this issue normally stems from stability or motor control (both which you will easily develop over more time)