Hi Paul, when your intuition screamed, “ Get off the bus” it was your soul begging you to listen. These turning points in life are meant to redirect you to where you are meant to be.
Staying at that school was no longer giving you joy. You can’t live like that.
Option:
Along with your book, and rather than teaching kids, are there options to teach adults? A part time such as photography (basics or other)? Explore all the options and keep your eyes open.

Do what you love and the money follows.