How do you get reviews?

Hello fellow authors!

I'm looking for your advice on encouraging readers to give honest reviews on Kindle books.

I've tried giving books away through promotions, running adverts and sending out to my existing mailing list but so far my books sit with exactly zero reviews which is very demotivating. How can I rectify this?

Are there reader sites that specialise in reviews? Wording that works well in adverts? What do you do get that review count up?