The protocol is don't contact them.
The only time I would contact a reviewer is if I submitted the book to a blog/review site and someone reviewed it. Then I would email a one sentence thank you note that I appreciated their time, without any mention of the content of the review or whether it was favorable or critical.
(ETA good luck with your book
)
The only time I would contact a reviewer is if I submitted the book to a blog/review site and someone reviewed it. Then I would email a one sentence thank you note that I appreciated their time, without any mention of the content of the review or whether it was favorable or critical.
(ETA good luck with your book