I understand you want to build this website quickly, but automation can only provide so much value. You best approach is to develop content at a human rate (not a machine rate) since the output will (hopefully) be valuable and something that Google approves.
AFAIK, most blackhatters use WordAI to rewrite other people's content. That's plagiarism and it's also something that Google knows how to recognize (and also shove into its supplemental results).
That's not what you want to hear.
I know.
But it's the truth.
To rank your website high -- or even at all these days -- you've got to play by the rules.
So look into outsourcing content development if you don't want to be bothered with it, and you want to focus on something else. A lot of people do that, and if the content is good, they're rewarded with a permanent residence in search engines. If you want more control over the way your content is developed, however, and you still want to get it done quickly, I can point you to a resource for that. Just send me a PM.