“Design A vivid cover with playful illustrations of a cheerful few in a very park or café. Use cheerful hues like pink and yellow, using a whimsical font for that title and a straightforward one for the author’s name.” The amount of big difference will a professional design seriously make? https://www.reddit.com/user/Trick-Bat-4187/comments/1l3o1cz/how_to_shape_up_as_a_brilliant_thriller_writer/