If you already have this idea, take action. Don't wait until you retire. If you can't move, you can't move again. In addition, teachers and freelancers, especially teachers in training institutions, are not contradictory. As long as students can be recruited and teachers are not worried about students, then teachers are actually freelancers. I recommend you to read this article "Teachers are likely to become the largest freelance group". In the Internet age, the Internet has given many people a chance to start over, depending on whether you can grasp it.