You can consider the surrounding areas of major hospitals, because my home is not far from the Second Hospital of Medical University. I know there is a Sichuan-style snack, which is very small and simple, but it is always visited by guests. It has been operating well for more than ten years, and tourists are mainly family members of hospitalized patients in other places.
In addition, there is a farmer's market (Hongda farmer's market) nearby, where there are food stalls for rent. It only needs a small sum of money, and the business is quite good. I suggest you have a look. There are many large farmers' markets with food stalls, so you can go and have a look.
In addition, the migrant workers in China Railway Bureau 13 are basically public catering, and it seems that they rarely spend money on hotels themselves.