How can I monetize a reach of 25,000 people per week?

So I have a method to advertise my local business, mobile detailing, using facebook groups and massplanner. I post something to my business page, and share it on 4-5 different accounts (Accounts belong to me,2 to my girlfriend, and 2 are fake profiles.) I share it to facebook groups like car sale groups, local yardsale groups, small business groups, etc. The posts get about 15k reach in 2 days, and about 20k by the end of the 5 day week. My weekly reactions according to fb analytics is as high as 25k reach, and 1500 reactions. I want to find a good way to make money using my method, I can get more accounts, more proxies, and get traffic through facebook groups and shared posts. My question is what product do I sell? I've only had success promoting my business with this technique.