What should I choose Django or Node.js

I want to do Web Development and I have covered the frontend part and I'm going to the backend part. So, which language should I choose Django or Node.js? I already know the basics of Python and its libraries like Numpy, Pandas, Matplotlib. And if I will choose JavaScript I can be a MERN Stack developer but I don't know the "J" of javascript what should I do? And I want to do some data science and machine learning later.

Help Me