A helpful tip has just occurred to me concerning book covers, although I haven't implemented it yet. As they say, readers need to see a book cover several million times before they become curious enough to check it out. So it might help to have similar covers on all your books. Then if a reader sees one cover somewhere, and sees another elsewhere, they might think it's the same book and wonder why it's suddenly appearing everywhere...? And that it might be worth looking into why it's so ubiquitous lately. ¯\_(ﭢ)_/¯
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