So many authors fall through the cracks with great books because they have not yet decided what part of their message in each book is the strongest. Your book can't be about everything for everybody. It has to be about something specific to speak to a specific audience. Otherwise, it meets with a "blah, blah, blah" attitude from readers and no one will take you or your book seriously.
I love reading from unknown authors but it takes more than a feature from me and a few other bloggers for someone to notice you and take you seriously. Marketing your book is marketing your message and that takes time and perseverance.