going to war one needs an army.
France had a demonstrably larger army than Germany during that time though.
Inviting Poland and Britain into it
Britain was probably unreachable. Their interests tied up in jewish finances and the Anglo obsession with their precious "balance of power."
But Poland had every reason to ally with Germany. Japan was a useless, shitty, worthless ally. She pulled Germany into stupid wars and Hitler paid through the nose for absolutely nothing. Japan was worthless.
Poland on the otherhand could have actually aided Germany diplomatically, economically, and militarily. 2 million extra men, better tanks than Germany, a large airforce, and strategic depth that would ally the Soviet invasion to be blunted in Poland before it even reached Germany. A Mitteleuropa alliance would have been fantastic. Especially without France and Britain being at war with Germany.