Best language for productivity related SAAS app - Node vs Python?

I have been learning to code over the past 6-7 months and building an app for collaboration. My web app (prototype) is in Python and my Slack integration is in NodeJS. I feel more comfortable with Node than I do with Python at the moment. My question is: given that the Python web app is at its initial stages, do I go back and rewrite all of it in NodeJS, or do I keep pushing forward with Python?