I've been programming for over 50 years. If I judge by the past (not necessarily a reliable choice), languages are not that important. They come, and they go.

I've been programming for over 50 years. If I judge by the past (not necessarily a reliable choice), languages are not that important. They come, and they go. I believe that you'd do well if you could demonstrate that you can easily acquire different languages as needed. Opportunities and careers are unpredictable. You should be able to seize opportunities when they arise. I suspect that you are vulnerable to obsolescence. Being familiar with multiple languages (not necessarily fluent) will likely be of more use that adding a single new language. Good luck.