Switch Kick Footwork
One of the mechanics that's used very frequently in Muay Thai, but very often done incorrectly, is the hop-switch to do a Thai roundhouse with the lead leg of your stance. This video should help if you're finding yourself off-balance or not at the right distance from your target after switching your feet.
An exercise you can do to correct your switch-kick footwork is to place yourself into the opposite of your natural stance (if you’re normally an orthodox fighter, place yourself in a southpaw stance, or vice versa), then take a step with your now-lead foot up and diagonally past your target into what would be your kick. Take a look down at your feet — this is where your feet should be landing when you switch them for your switch kick. You shouldn’t be placing your rear foot close to your target when you hop-switch, nor should it be going “vertical” directly toward your opponent, as this will make the momentum of your hips go forward, not make them turn properly through your switch-kick. Your rear foot should cut forward enough to become your front foot, but not too far forward, and it should have some sideways movement and its toes should point past your target to direct your kicking hip.