Do It yourself cover design equipment like Canva can be useful for mockups or social media marketing illustrations or photos but not often match Specialist specifications for print. . Established the inside margin (gutter) generously — KDP necessitates more substantial gutters as web page rely rises, so Look at KDP’s https://whitemagicstudios.co.uk/blog/5-trending-book-themes-that-you-can-write-on-for-kindle-self-publishing/