How about this ad?
I’d tried a mess of keywords for first book “One of One” and got one impression. That’s right, one. It was a very cheap ($0.22) and highly ineffective experiment. Forget keywords.
So for Shape of Secrets, I looked through Amazon’s suggested sub-genres. One was LGBT Fantasy Fiction. That was a category? Okay, the book is about a young gay man who can alter his appearance to look like anyone, so I guessed it fit. I tried it and got 87,684 impressions, 170 clicks, and sold three books. Hot damn. Yes, I’d spent $63.22 to do it, so I was losing money while Amazon was laughing all the way to the bank, but at least something was happening.
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