The Enabling Law was passed in March of 1933. This was a very important factor that allowed the Nazis to remain in power. It did so because it allowed Hitler to rule by decree.
After the Reichstag Fire, Hitler was able to convince Hindenburg to give him tremendous new powers. These powers allowed him to suspend all political rights for everyone in Germany. Once this was done, Hitler and the Nazis were able to suppress their opponents.
When the Nazis had managed to silence their opponents, they no longer faced much resistance. For example, when it came time to pass the Enabling Law, they prevented all of the members of the legislature who disagreed with them from entering the building. This allowed the Enabling Law to pass, giving Hitler the power to rule by decree.
The ability to rule by decree was hugely helpful to the Nazis. It allowed them to do whatever they wanted. They were allowed to make any laws that they wanted, regardless of whether those laws would have been legal under the German constitution. The power to make any laws that you want clearly gives you the ability to stay in power.