Sponsored Influencer Posts - There are a number of services like HYPR where you can list your accounts and brands will get in touch with you to post photos of/with their products. Alternatively, you can do direct reach-out to brands that fit your audience
Product Sales - There are a heap of tools like Have2HaveIt that let you change your profile link to a shop page - when you post photos of products, followers can click through and buy from your online store
Affiliate Sales - Again, I'm sure there are similar tools to Have2HaveIt for affiliate selling. Do a Google.
Social Media Marketing - write a huge post detailing how you grew one of your accounts. Somewhere in that story mention that you run your own social agency. People will find you and ask you to help manage their brand.
Build Accounts + Sell them - you'll be talking 50-100k users. The more likes/comments (engagement), the better.
Run a Kickstarter - if you REALLY think your audience is engaged, capture those users into a Kickstarter for your own product. This is tons of work and you really need to be sure you can activate your audience if you go this route.
I'm currently at about 13k with @YahtzeeDog. I've been getting free stuff sent by brands and by the time I hit 20k I expect to be doing some sponsored posts.
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