Instead paying a SMMA agency I could pay an influencer from instagram/facebook/youtube to say a few words about my company or my products..
Two years ago, I saw on TV the pitch invader who made advertising for Vitaly Uncensored , he earned 1,4 mil instagram followers in less than 24 hours.
If I own a restaurant I could place advertising in town that on X day, every 10 pizza is free (or 50% discount... you got the idea) ...so if you come up with crazy ideas you don't need SMMA
Just my 2 cents, you can try to open SMMA because not everyone thinks like me... you have nothing to lose.