I don't know if this will help with visibility. But I typed in "suicide" in the search window on the kindle page. There are 168 pages dealing with the topic. Not sure how long my book has been there, or how long it will stay there or if it will drift back to page 98 in the future. But, for now when anyone wants to read on the topic and is looking for a book and types in "suicide" my book, page 2...Merry Christmas to Me!
Perhaps, it's because I look at my books page daily and this is why its on page two for me but for other browsers it may show up different? (I've noticed I'm selling copies with regularity since first week of November)