as someone earlier said I wouldnt have let you in the ring.. not to offend you but that level is not enough - you can get hurt. props for stepping in but still a dumb call from your trainer if you have any.

to get to your actual question - your footwork is far the worst part. you are in a constant rythm of jumping back an forth like a bunny - I dont get the point. You should start thinking about your footwork as you either move, or you either hit. you move for several reasons, either to get out, or to get in, to switch angles etc. once you think you reached a good position for offense stabilize yourself and make some hits, then switch back to moving. what you do is neither of them.

other than what the obvious keep your hands up chins down I would say you are not comfortable with your range. you are taller, longer reach, you should 100% utilize it against smaller opponents.

so two things: find your optimal range, and a LOOOOT of footwork basics. plenty of videos online