When Gone Girl author Gillian Flynn was trying to write her very great, very creepy novel Dark Places, she was having trouble with the heroine, who she initially wanted to seem different than her earlier protagonists. According to this article from Fast Company, Flynn showed some pages to her husband. He read them, poured her some wine, and said, “you can tell you don’t like her, and you don’t like writing her.”
It was a very good lesson, which is: don’t let the outside voices tell you what you should be writing. You’ve got to write the book that you’re supposed to be writing, not write the book that you think people will want to read or the book that will sell better or the book that the critics will like more.