I mostly code in C, C++, Python, Emacs, Almquist, GNU Make, and VanillaJS. I have been for more than two decades. My website looks like danluu.com and bellard.org. Why do I need to change?

I highly doubt there's anything in that list that can't be done by C; why didn't you stop after learning C?

This is why you still have to learn stuff, it turns out that new technologies can be useful.

Only halfwits think that languages and tools are the things worth relearning.

I see you have conceded to my point that learning things beyond just C is useful.

Enjoy the rest of your stay.