I submitted my book to nearly 20 sites a couple of weeks in advance. All were free sites. A couple of sites required at least 5 reviews and a minimum of a 4 star review. Luckily I had the minimum. Also, on the first free day I submitted my title to several facebook accounts.
The result: I had 750 downloads in the two days, two 5 star reviews, and several messages telling me how much they liked the book. In all I think a decent promo. Not as good as some that I’ve heard of. Maybe next time.
The end result: In the next two weeks I saw a rise in paid sales. That was great! But now they have settled back down to where they were. I’ll have to work on that.