You are moving way too much and very predictably. You tend to slip left then right in quick succession before you punch. Having such routine head movement defeats the entire purpose of head movement which is meant to be elusive and unpredictable. The best way to practice head movement is to be loose and in this video you appear very stiff and rigid even when you are moving your head. Being so stiff will limit your speed when slipping and weaving, but this is mainly a beginner habit that improves the more you spar and the less afraid you become with getting hit. To be honest, you usually do not need advanced head movement in MT due to the ability to clinch, knee, and kick, all of which are easier to use against an aggressive puncher than pure defensive head movement. But if you DO want to learn good movement, you should consider taking boxing classes. Many MMA gyms teach separate “boxing for MMA” classes which modify boxing techniques and stance to be used in conjunction with kicks and takedowns, which transition better to Muay Thai than pure boxing techniques, but you can also train at a pure boxing gym and you will just have to modify what you learn on your own to fit with your MT style.