But you're honest about it, and that's 2/3 of learning. :-)

If you love Javascript and web, then definitely go for that. But I recommend, if you can do it and don't hate it, learning modern C++ too, while you're still early in your career. Having both of those tools on your belt will make you a lot more capable, and thus valuable, especially in the blockchain world, where a lot of the most interesting projects are written in C++.

If you do work more with C++, seriously question whether your university is teaching you good, modern C++. C++ gives you plenty of room to make mistakes, and many teachers push outdated techniques that make it much, much harder to stay out of trouble with things like memory management.