Former author - publish content online?

Adsense and any other CPC/Crap programs will pay crap. If I was you, I'd sell digital copy of my eBook.
 
Seems like a good way of getting some extra money, as an alternative you could try selling the books through kindle publishing (assuming that's not what you're doing atm). The potential profits may not be as much, but its the sort of thing that you can make money without having to go through too much work in terms of promotion
 
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