The Depression was a global affair, larger than one president’s actions, and most of his policies were fairly conventional for his day. He had left office over 6 months before the depression began (and over 2 years before the banking crises that caused most of the misery really kicked in). Since pretty much every leader (including FDR and Hitler) had to figure out how to solve the crises in office using unconventional policies (the then new-fangled Keynesian economic policy), it’s a bit unfair to blame the guy when he wasn’t even in power.