Building a community for the content creators to use your products?

How does one build a community for content creators (photographers, videographers, and others) to talk and showcase their work as well as setting up a storefront to sell their art as products to their clients and fans. Doss is in the business in that sort of platform. So now, I've launched my mvp and I'm looking to build my community. I'm currently using social media, instagram being a big one, but I need more ideas. I'm going to head towards bloggers, podcasters, youtubers, and others. But any more ideas to build my community?