Sean’s and Christine’s answers are right on.
One other thing that came to my mind is that the age of the participants can also be a consideration. An older crowd often appreciates predictability. I had once been teaching a very similar choreography for years. Just changed the music, and my class was always full.
Be also prepared to change things if you are losing the class. This can be difficult for a new instructor because you have your plan and not yet that much experience in changing on the fly.
I wish you luck and success.