From the various stories I have been told he was very good at convincing people and was able to bring all the people to his side since there was a massive economic collapse and everyone just started bandwagoning with him.
https://www.reddit.com/r/AskHistorians/comments/1eqvqy/how_did_the_nazi_party_rise_to_power/?utm_medium=android_app&utm_source=share