I wouldn't have sieged Leningrad, just surge rushed it and took it immediately.

More seriously I would have done the thing Mohammed did and insisted upon not translating my word, so that it would be harder to corrupt (still allows for shit like including a bunch of discussion about my words, but at least the words are still there untouched). Also I'd hire a scribe or something to write things down in my time, so it would be definitive. And I'd talk a lot more about how being rich doomed you to hell, like he did in that book that's no longer part of the main canon