What's an unassuming but stuffy industry?

Children's interest classes. Rent an old warehouse for a year, decorate it, recruit some fresh girls (with or without qualifications) to be a teacher, and casually take the children to draw, write brushstrokes, recite poems, memorize hosting lines and so on. Don't charge too much, can't be too cheap, try to make it a yearly program that comes every weekend. In this way, after-school care classes can be held on weekdays and interest classes on weekends, without conflict. Don't worry, there are parents who feel that "we can't let our children lose at the starting line", but they are not very educated, so they willingly pay for their children to come. What do children know? What do parents know? Let the teacher to make the child happy, can write a word to memorize a poem, is not the children and parents are happy. If you have a contest, it will be even more profitable.