If there are more vendors selling lunch boxes, it proves that there is no fixed delivery restaurant in this office building or this area, or there are fewer simple meals restaurants around, and the passenger flow is very large, which is in short supply.
There are few or no stalls. It may be that the hawker management in the jurisdiction is strict, or there are already fast food restaurants or fixed food delivery around.
From what you wrote, I think you don't know much about all walks of life and analyze yourself too little.
There are many individual businesses in places like computer market and clothing market. Older people like to bring their own food to the boiling water pot for heating. Younger people like to buy rice, but they don't necessarily have time to buy rice, but they don't eat too much. They prefer to push trolleys around to buy meals and food that are taken back to the shops outside.
Most office workers in the office building basically eat meals bought from outside. If enterprises cluster together, the relationship between office workers and vendors in office buildings and fast food restaurants is basically that there are more wolves than meat ~ ~ I have worked in this environment before ~ I can't buy food around the office building after work at noon. . . There are also some companies that have group catering, but our company doesn't have to fight for food. ...
Salespeople in shopping malls and self-employed households eat basically the same.
If you want to do this, you'd better have written your business plan ~ and shoot the video you made, set the initial price, and then contact the customer, so that when others order your fast food, others will think you are sincere and at ease.
You have nothing in your hand. It is human nature that others ignore you.