My classes have a regular attendance of over 40 people and I already teach at a very high level as far as energy output, and I aim to inspire the entire class every time I teach. While this has been working and is working for me, I would like to add or change some things up.
I would add an emphasis on the social level. Often people keep coming back because of the connections they make in class. Add a few partner drills (and make sure everyone exchanges names). That will keep things fresh and help with the social aspect.