Nowadays, the makeup industry is not bad, people's living standards have improved, and many people want to be beautiful or like to take pictures in the photo studio. These all need a makeup artist, but only if you have a good technical level can employers use them, or if you have the strength to open your own shop.
If you want to learn, I recommend you to read the British and American classics. They are very professional and the teachers are very good. You are sure to learn a lot.