When you self-publish, it's always a challenge to get reviewers to read your work. Try operating outside the mainstream if necessary.
Amazon keeps a list of Top Reviewers. Start with No. 1 and work your way through the list, looking for reviewers who review your type of book. Email them and offer them a complimentary, signed copy for review if they will consider reading it and posting their review on Amazon.
If you get a good review, you not only get it on Amazon; but you may be able to use it on your book cover as well.
If your book gets bad reviews, well . . . maybe it's not that great. Might as well know the truth.