How can we explain the transformation of the Nazi party

1: How can we explain the transformation of the Nazi party from a marginal political and ideological force that secured less than 03% of the national vote in the federal elections in Germany in 1928 BUT by the summer of 1932 was able to secure 37,4 % of the votes? What political, socio-economic, and ideological reasons do Donny Gluckstein, Axel Fair-Schulz, and Chris Harman suggest (explicitly and implicitly)?
2: How does the Nazi regime present itself in the propaganda film Triumph of the Will? How are the themes of War and Peace, the Memory of WWI, Racism, Anti-Semitism, Anti-Leftism, Capitalism & the Great Depression, the “People’s Community” or Volksgemeinschaft, as well as issues of Class and Gender navigated and presented in this film?