The meme shown below gives several answers to the question about why authors ask their readers to write reviews, especially on the various Amazon websites.
In particular, it is very important for an author to get more than 50 reviews – see the second point on the meme – and as I am only just past the halfway point for this goal, I really am asking for your help, please.

 
					
Just finished reading the book’my cup runneth over’its a fantastic read😊Really didn’t want it to end.Looking forward to the next one.
Thank you, Debbie. Your comments are kind and are gratefully received.
Hopefully, the second book in the series will be published this autumn.
Finally managed to get the book from Lorna, does remind me of times past, very good, keep it up with the next one.
Thanks, Keith, that’s much appreciated. (Oh, and I’ll do my best!) 😀