My back comera is shaking while use

It sounds like the camera might need to be replaced. Either the iPhone 11 or the iPhone 13 (I can't remember which) had a problem similar to what you're describing, which was caused by stress on 4 tiny wires that helped to stabilize the camera from shaky hands and other vibrations. Said wires were very prone to breaking, which rendered the stabilization system useless. I wouldn't be surprised if the Air used a similar, if not identical, system. If you were using your phone on a motorcycle or something like that, or maybe just shook it really hard or something, I'd say there's a good chance that the stabilization system is busted. Unfortunately, the only way I can think of to fix this is to replace the camera.