I like to determine the best possible title for the book as soon as possible. Often the author already has a title in mind. We need to spend time discussing the title to make certain that it peaks the interest of potential readers enough so they open the book or just look inside online.
The length of the title and font size are critical. Too long a title with a small font will be unreadable as an Amazon thumbnail. Even on the small size online the title should be clear and large enough to read and understand.
A good title can sell books so it’s important to take time to develop the best title for the book.