A professional cover will also Enhance the book salability. Reedsy not long ago ran an experiment wherever we requested our professional designers to rebrand existing indie books. They do a very good work at publishing and so they even have some of the best book cover designs to choose from https://whitemagicstudios.co.uk/blog/what-you-can-do-to-find-childrens-book-illustrators-for-hire/