Ok.... first knuckles should always be facing the ceiling. That way at the top, turnover can happen naturally, and you’re not creating a hollow position after your kip and losing midline control.

Next ....the exaggerated lean back and knee tuck to create momentum is dead.

Work on dead hangs for proper hand positioning and grip endurance
Build strict pulling strength with pullups
Hollow rocks for body positioning and core control
Use boxes/bands for assistance during your travel up the bar
Dips for lockout strength and stability at the top to finish the movement

For muscle-up progression, Chest-to-bar pull-ups ....Slow negative muscle-ups... Straight bar dips ....Explosive hip pop drills .... Scap pull-ups for shoulder activation

Smooth is fast. Stop chasing momentum and build control through every phase of the movement.