Listed all my books on Amazon exclusively, print and ebook, because that's what I thought we were supposed to do. Then I found out we were entirely at the mercy of algorithms well beyond our control. We had no leverage to negotiate with bookstores, for example, or with box and chain retailers.
Left the ebooks on Amazon, but shifted everything in print to IngramSpark, which opened up my own ability to speak and negotiate with other retailers, small and large alike, on favorable wholesale terms.
Still negotiating with several small, independent bookstores globally, but IngramSpark is what allowed that option to exist at all.