I think WeChat circle of friends is a good way to promote it. You can get a virtual positioning software to search nearby people, one by one. It's best to get more micro-signals, so that more people join in every day. It is not recommended that you use some software that automatically adds friends, because it is easy to be named. What you need to do well in WeChat marketing is "mixed face".
At the same time, regional classified information websites such as 58 city, market, people and some regional forums are also good.
What you need to attract is people around you, or people from the same city, so you don't need to have a wide range of promotion, because it is more targeted.