Depending on the direction you want to go in your career, it's still a major need.

Any complex or high-performance computing relies on C/C++ pretty heavily still.

It's also a good tool to have in your box for building well-performing cross-platform native apps with Qt.

I say this as one who's probably at the same stage as OP. Know some C, and reasonably comfortable with the basics. Application of C++ is a little more widespread outside of strict embedded environments, however. (Another space I personally want to immerse myself in)