Social Networking - gain real Instagram and Facebook engagement and followers (SPANISH language required)

I need help growing my audience on Instagram and Facebook, through organic growth rather than paid ads. The winning bidder will be able to promise to achieve results in terms of increased numbers of followers who are genuinely interested in our service / products. We are a small business offering signs for the specific market of boats / yachts / sailboats. Our main market is Spain and its islands, so our freelancers need to be able to post in Spanish without errors. Insta: @funkymonkeyrotulos and Facebook Funky Monkey Rótulos Náuticos.