I recommend the following books to you:
1. " I Have a Cultivation University ": The story was about Lin Zhou, who unexpectedly became the principal of a cultivation university and faced the crisis of the recuperation of spiritual energy on Earth and the invasion of the demon world. The protagonist's identity as the principal could be said to be one of the greatest features of this book.
2. " Greetings to the Headmaster ": The story is about a teacher of the people who transmigrated to another world to become the headmaster of a magic school. He used the knowledge of Earth to transform the other world. It is a light novel, a novel of the original fantasy type.
3. " Peerless Master ": The story is about a golden teacher who transmigrated to another world and became the principal of a magic school. With the assistance of the Peerless Master System, he can nurture all kinds of genius students.
The above is the principal protagonist novel that I recommended for your question. I hope you will like my recommendation.