I'd suggest trying to think about what types of things you want to build in the future and then picking a language that is used to build those types of things.

I can shout "learn assembler" until the cows go home, but if you want to go into AI and hate the idea of being an embedded programmer, then you'd be much better off learning LISP.

When I was a bit younger, everyone told me to learn PERL, because PERL was very powerful. I learned it, but never really needed it, because I never needed to write software that was heavy on text processing or system administration. If I were able to do it all over again, I would have picked R instead, because it would have been much more useful for my career path.