If you want to change jobs, you can consider a tennis coach, a squash coach, a sports center coach or a coach hired by a school company. Why tennis? Badminton is not a high-end sport. I came from badminton and now I can only be a hobby! Tennis is still very popular in the upper class. People who have studied badminton will be proficient in tennis as long as they study for a short time. Being a personal trainer or something, the income is still very objective! Tennis has always been a sport for high-end people in Europe. If you are considered a professional, you will be rich!

If you continue to do this job, you can only be a physical education teacher, teacher and coach at school. My friends upstairs say you sell sporting goods. Unless you are YY or a specialty store of some big brands, you might as well be a small white-collar worker.

The above is purely personal experience and opinion, I hope it will be useful to you! Please add points if it is useful.