Is anybody doing "Parrot Secrets" type eBooks? And if you have and are reading this, what have been your best selling books? Referencing this sort of thing: http://www.parrotsecrets.com/ An explainer: https://www.cringely.com/2009/03/14/parrot-secrets/
General guideline from Russel Branson's "Expert Secrets": Pick one of the 3 major hot markets (health, wealth, relationships), pick a sub-market, then create a new niche in that sub-market (not recommended, but you might succeed competing with an existing niche).
"Stop your Divorce" [2] was written in the same way, and seems to have sold pretty well. (Also netted the counselor a lot of leads because his phone # was in the book.)
Interestingly, there's a counter argument to the advice presented in the "Parrot Secrets" book: [3]
[1]: https://shop.stackingthebricks.com/sales-safari-101
[2]: http://www.stopyourdivorce.com/
[3]: http://goodbirdinc.blogspot.com/2013/06/internet-fraud-targe...