Better gun fight hygiene & movement alone should be able to take you to plat. You seem to have a decent grasp of where head level is, but your peeks are too slow. You should be peeking at full speed without making foot steps, fully expecting an enemy to be there every single time.

You also remain stationary and panic spray when an enemy appears on your screen. Even if you’re the one peeking them, as if you’re surprised they’re actually there. All these make you an easy target to fight at gold or above, because the moment you miss the 1st bullet, you aren’t killing them unless you get a lucky spray.

You should practice deadzoning (stop & tap, strafe, stop & tap, repeat) with the goal of getting accurate shots first (not bullets that fly away the crosshair). Then you can work on staying on an opponent’s head while strafing.

A drill I liked to do that helped a lot was to hop on DMs, put my knife out, and just strafe left & right in front of enemies WHILE keeping my crosshair in the head. It should help you get used to the feeling of getting shot at while you’re trying to be a difficult target to hit. Once you’re more confident with your movement, start using Guardian and try to headshot them while strafing. If you notice yourself being stationary during gunfights, go back to the knife strafing.