After 8 years of being involved in the self-pub world, I've come to the conclusion that Amazon sales can (but not always) have little to do with the book's quality, exposure on social media, the cover, the blurb, the genre, whatever. It might be simply that it never got enough initial, regular sales and reviews to click the Amazon algorithms into 'start recommending and making generally visible to readers' mode.
And if your book doesn't hit that wave, it can become all but invisible on the site where most people buy their ebooks. The less it sells, the less it will continue to sell. If Amazon was a physical library, it would be tucked away on the bottom of a dusty shelf at the back.
I decided to start a short (and probably irregular) series of recommendations for books that really ought to sell brilliantly, because they're exceptionally good.
This isn't just me giving a shout-out for some writer friends, or saying, 'this is alright, you might like it'. I'm saying this:
I've chosen books that an Amazon robot has either misfiled on a back shelf or left in the stockroom by mistake—today, though, they're where they should be: on one of those cool little display things at the front, near the counters :)
The Tudor Enigma Trilogy by April Taylor
16th century - Alternative History
Back Home by Tom Williams
Victorian London - Crime
The Planter's Daughter by Jo Carroll
19th Century - Ireland - Australia - New Zealand
Long Shadows by Thorne Moore
11th, 14th and early 20th Century - Wales
The Worst Journey in the World by John R McKay
WW2 Naval - Liverpool - Russia
New York 1609 by Harald Johnson
17th Century - New York