How about being a researcher in a market research consulting company? Found that there are many such companies in China.
If you are an investigator, it is very hard, and you have to travel a lot a day, but if your performance is good, your commission is also high.
It would be better if I were in charge.
It's best to go to some formal companies. Because the scope of market research is very wide and the law lacks this provision, some companies do some illegal acts, such as investigating extramarital affairs.