Paranormalis

I suspect that many readers will not get behind a paywall and read an entire book, to hear your proof that god exists. Any trace of confidence in their existing belief will make it fall on deaf ears before they start reading. You write because you want to get a point made. People buy books for the knowledge they gain and psychological benefits.

Yeah, I've been speaking with atheists about my book. I'm more than happy to engage in such debates, but after hundreds of them, I decided to write a book so that I may point at it and not have to keep repeating myself. The arguments, views, reasonings, etc. in my book have not been refuted by any atheist, despite hundreds trying.

It says a lot that atheists are not even willing to give it a try, as it's an entirely novel approach and one that is not the usual apologetics arguments. Likewise it's convinced several atheists to become theists, myself included.

The book is fairly cheap at only $5, and it's a much better bargain than something like CS Lewis' "Mere Christianity" or Lee Strobel's "The Case for Christ" and yet atheists have purchased those (despite them being the same stale arguments).
The book now serves as a showpiece for an unrefuted argument for God and other spiritual topics.

If someone needs proof of god's existence to do good deeds rather than blind faith, does that still qualify getting into heaven when goodness becomes a selfish act?

Morality and heaven are kinda a different topic. Personally I don't believe in either objective morality, nor heaven. Instead I believe in reincarnation. But afaik it doesn't matter your motive, as long as you follow the rules?

Atheists don't have "other" gods, so I guess that works.

Feel free to start a thread about your book in the spirituality section. To give it maximum visibility.