Just one language? Of course not that's selling yourself short. Surely, with great effort and many years, you can master many languages, and use them masterfully in concert like many do with C and Python. And if you can do that then you can master the many faces of C++. Maybe you just don't need to.
Which language do you have in mind?
Who knows, I'll rather use a mixture of languages than C++. C combined with other languages will suffice for now, as most of them are simple enough to understand entirely.