P.S. Don't bother targeting other Pinterest users. Most post with Tailwind and only quickly check their messages and comments... they have little interest in other websites.
Pinterest is great at ranking in Google for image related queries, especially for listicles. You'll likely get better results from people who found your Pinterest after a search on a major search engine than from any other Pinterest account. Target accordingly with your pins? Getting more followers can't hurt but is not likely the cure, either.