This is a common issue for self-publishing authors. They work very hard to get their book out, put it on Amazon, sell a few and then… nothing. Without publicity, statistically, authors are unlikely to sell more than 50-150 copies of their book regardless of the work they put in.
For some authors, this is fine. They published their book in order to give it to family and friends. For authors who want larger sales, or who are interested in being part of a larger literary conversation, this can be deeply frustrating.
For authors who have sales and exposure as a goal, our advice is to start on a formal publicity plan and re-release the book in the months to come. This works as long as you have not already submitted (and been rejected) by reviewers already. This can be tough on authors because they feel they have waited a long time to get the book in print but this is how publishing works: slowly. If you want to keep your book up and start publicity after a release, this is possible though not preferable. Contact a publicist as soon as possible to mitigate the time issue.
In addition to this, if you are an author wanting to self publish, but you need help with some of the elements of completing your book, then you can check out Author Now, our publishing division that specializes in helping authors get to market.