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I've literally sold 7 books on Amazon this month but this is what worked for me in 2019.
Edit - if you are running category ads you can use the keywords the algos place you in and try starting with lower bids. Maybe since the algos have already decided the book is relevant the lower bids will work. Just a theory, I haven't tried it.
This is my observational opinion. However, I think it has merit.
As does Amanda, I watch the spend at the keyword level. Twice in 2021 I have noticed significant drops to the impression counts with no change on my part.
Empirical: This week with
no changes to any of the six ADs currently running, impressions dropped from Wed to Tue by
90%.
More specifically, I tweaked keywords on Fri/Sat last week and started to see an increase in impressions (and orders). The trend peaked on Tue. Then BAM, nada on Wed or Thu and Fri does not promising.
Having been a coder for over forty years, I can
feel the change in their algorithm(s). Hence the observational nature of my opinion: 'Zon advertising and the whole K-D-P universe is starting to
feel like a trend toward the Auderble debacle.
Cheers,
R.C.
P.S. Yes, the spelling error is intentional.
P.P.S. "Day-of-the-week" bias for impressions is a factor but, hopefully, it is not 90% day-over-day.