I don't know whether your area is a school, a business or a residential area. If you are a school or a resident, you can build a WeChat group to praise customers, or you can ask customers to praise them in a circle of friends, saying that they are affordable and delicious, and directly reduce 3 yuan. Or in the business circle, you can talk about cooperation with nearby companies. Outside the platform of US group take-out, public comment, hungry, etc.