Hi Taii,
When you teach too much, you lose the essence of your own practice. Fuel it by reading a book and joining classes or workshops. What you need is to change your perspective and ask yourself why you are feeling this way. What can you do to make yoga feel deeper? It'll never be like when you just started doing it cos you are fascinated with it. All practitioners go thru the same problem of finding a way to keep themselves fresh and wanting to go deeper into yoga.
It may start as a physical practice but it's the gateway to something deeper within