Market research will also inform which social media platforms you choose to promote your work on because you'll know where your customers are online.
For example, many professionals use LinkedIn and LinkedIn groups. You might also find them on Twitter. If your audience is designers or florists, you might find them on Instagram and Pinterest.
Maybe you're looking for creative agencies to serve. Dribbble and Behance are platforms to look into for agencies. The whole idea of market research and audience personas is to help find the people who need your services. Then give them answers to their questions and ways to solve their problems.