This isn't a great angle for a firm check. That being said:
1. Get both your feet under tge bar when you go to unrack. Literally squat tge bar up from the hooks.
2. Get much, much tighter through each rep. You are loose, soft, and wiggly.
3. Your knees are all over the place. Narrow your stance abiut half a foot's width. Get a tubow and get your knees dialed in by tracking to that.
4. Get more bent over when you squat.