AI tools

I am writing a short non-fiction ebook on grace that will sell in the $1.99 to 2.99 range. The purpose for it is more message than financial gain. I am treating the work as I did my previous two books giving this book the full blown effort of process even though the outcome is not my pocket.

To save some of the upfront costs of self-publishing, what AI tools can I utilize to finish the project?