Have you heard of Amazon kdp, kdp stands for Kindle direct publishing which is a platform that allows authors to self publish their books
And make them available for sale on Amazon
It's a great way for writers to share their work with a wide audience and potentially earn royalties from book sales
 For those that aren't good with writing you can create, example notebook,graph paper, composition book, workbook, etc
You don't have to write , you just have to know how to create with your phone and upload them for sale to amazon