KDP activity books: The Master list

If you want to discover hidden niches that only a minority of self-publishers are secretly profiting from to make KDP sales you can't even imagine in your wildest dreams, then this Master list is for you.

This list futures more than 4000 activity books sub-niche.

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Get your copy, and start making activity books that sell well!

NB: put 0 as the price to get the list for free!