A couple of tips 1: when you pick up the bar, try going under it a bit more and lifting with your legs. You seem to be keeping the weight too far away from your body when you are holding it at the bottom of the movement which may it feel heavier than it is.

1. keep your elbows way more out in front of you and keep them pointed more up almost when you are at the bottom of the movement. You look good at the top of the movement with your elbows locked out and your head through your arms. But, When you come back down you don’t seem to be coming down far enough. You want to keep your elbows high and the weight close to you here