After five years teaching in cram schools in the evening, I returned to the States and taught middle school for a couple years at a Catholic school in the city of Chicago before transitioning to high school in a middle class suburban district. And, at each stop along the way, I just found a performance approach seemed to equal engagement. In all honesty, I now realize I may have been overestimating the engagement level, especially when I consider the insight that "too often school is a place where kids go to watch adults work." I also had a great mentor who once advised me to make sure I don't "become a caricature of myself." Reflecting on these ideas is helpful. We do need to be "on" quite a bit, but it's important to remember we can also be human beings and be vulnerable. Otherwise, it's easy to burn out.
Reflection is the key. Be thoughtful about what you do every day, and ultimately be true to yourself and what your style of engagement is; for at then end of the bell, the only important consideration is whatever works. Just teach kids. Not just content. Not only skills. Teach the kids.