Many book promo sites won't accept you unless you have a certain amount of five - star reviews. (randomwritingrants.com)
Of all the different book promo sites I have use One Stop Fiction is simply the best one I've used to date. (onestopfiction.com)
Ad stacking across multiple book promo sites to sell / give away more books and in the hope that your book might stick on the store sites for longer. (marketingsff.com)