I have learned Wing Chun now, what is the use of it?

You can be a Wing Chun teacher! Or you can open a morning exercise class to teach some fitness elderly people to learn, like square dancing. If you do well, you have a bright future, because dancing is usually done by aunts, but in Wing Chun, both uncles and aunts can do it, so it is still very useful. , it depends on how you use it