Also, don’t be afraid to use a program like Grammarly to edit your ebook.  It may catch errors that you have overlooked, and as of right now, the program is free.

Though it’s not a necessity, we recommend that you send your ebook to an editor.  You can find a reasonably priced editor on Fiverr.com or you can search for an editor online. Aside from grammar corrections, an editor may give you suggestions on sentence structure, information missing from your plot or subject matter, and about the overall layout of your content. 

Maybe you’ve written an excellent paragraph but it’s just too big. It may be more pleasurable for the reader if that massive paragraph was broken down into much smaller ones. Among many other things, an editor can help you with these issues.