Decent for a near-limit set. Let's make them better.
1) You're going too deep. Just below parallel is all you need. The problem with going as low as you are is a) it makes the lift harder than it needs to be without doing anything that we want, like getting more muscle involved or training a full ROM; and b) it forces you to round your lower back at the bottom. Which you are.
2) You could be tighter. Going less deep will help. Squeezing your abs HARD will too. Also narrow your grip and squeeze your shoulder blades together to keep your upper back tighter.
3) Keep your chest up. Which is done with your upper back. Your back angle collapses a bit as the reps get harder. Your back angle should be constant out of the hole.
4) Hip drive. You're going back out of the hole; you want to go STRAIGHT UP. Watch your knees - see how they go back out of the hole, changing the angle of your shins? You want your knees to be anchored coming out of the hole and DRIVE YOUR HIPS UP to get the weight going. When you nail this part, you'll be amazed at how much easier the set feels.
5) Knees out much harder. They're coming in at the bottom. Point your toes out maybe 10 degrees more. And you may want your stance to be an inch or two wider - it's not egregiously close but it'll make you a little more stable.
6) This just may be the angle of the video but it seems like you're not quite standing all the way up. Do.
This seems like a lot but they're mostly connected. Get tight, shove your knees out, hit the hole and then BAM straight up with your hips.
Work on all these and post another video. No need to deload, just focus on technique, especially on your warmup sets. Good luck.