My advice (after also having spent 'too much' time on C++) is to never focus on a single language, it's better to have a shallow knowledge of several languages than a deep knowledge of a single language (especially when it's a "fractal complexity" language like C++ - the mental capacity to deeply know C++ is enough to be productive with 2..3 less complex languages).

Usually it's not the programming language that's important, but the ecosystem around the language (the standard library, available libraries, interests of the community etc...). Programming languages are mostly interchangeable, but their ecosystems are not. Some are more suited for server backend work, some for writing UI applications, some for scripting and automation, etc...

After a while (and a few languages under your belt) you'll select a language based on a project's requirement, instead of trying to shoehorn every project into your favourite programming language. IME the multi-language approach is much more fun and fullfilling.