What should I learn (Python or Node.js) to get better job opportunites?

I am a browser extension developer, working in a small company. Basically my work is to develop and maintain extension for their product. I have knowledge of javascript, css,html. I have about 2 year of experience. Now I am confused what should I do to get better job opportunites. Recently I starting learning React Native and taken this udemy course. In which direction should i head. Should I learn nodejs or python for backend. Will my experience be counted or not, as I have no experience of any frameworks.