@Haley-Browning You have great skill!
Teaching seems so intense, I don't know how anyone manages to do it let alone try to start illustration on the side...
But if you have a goal, give yourself the means to achieve it. The current situation isn't giving you the opportunity to pursue what you want, so you'll have to change it in order to start working on your goals.
This could mean reducing your hours as a teacher (if that's possible) or finding a job in another field that's less stressful and intense to allow you time and energy for illustration. I know lots of artists who work retail or in the service industry, because when their shift is over is OVER and they can go home and still have the brain power to work on their side hustle or dream.