The only chance he had, while still taking Poland, was to not meaningfully attack France, Netherlands, or Britain. Make it clear he was willing to settle with them. None of those countries were thrilled to be in a war, that would have been the end of it with a new map of Europe.

The West didn't care about the Holocaust and felt more threatened by Russia. The war in the Pacific would have still happened of course. And there's a fair chance the West would have teamed up with Hitler to fight Russia.

Anything beyond Poland was just a bridge too far.