You've likely grown as an author as your series developed, and there's always a chance book one isn't as strong as it would be if you wrote it today. (amarketingexpert.com)
So, it really is important to invest if you're really wanting to grow as an author, grow your brand, or sell more books. (trainingauthors.com)
I know that can be intimidating, but a freelance editor is one of the best ways to grow as an author and tighten not only this story, but every future story. (kathyide.com)