Book marketing 101:
Compile book lists, including local schools and libraries, print newspapers and magazines, radio and television. Expand and update as you network, include bookstores, book reviewers, authors, editors, and publishers whose books you love. Even all those business cards you’ve collected from conferences over the years. Update contacts as you network. Post in your own platforms, even if only once weekly, and your will gradually grow. And keep in mind, publishers don’t necessarily care about the numbers of followers, but more who your followers are, and those who you follow.
Writers, editors and journalists—those in the publishing industry, need to have a social media presence, even if that means stepping out of your comfort zone. Gradually, your contacts will continue to grow—and lead to opportunities like creation of writers/critiques groups and support networks.