Ask HN: Master 1 language or learn several languages intermediary?

I'm a senior graduate student studying in India with BS in CS. We've been taught several languages throughout the 4 semesters particularly C & C++ in the junior year. But I always felt that the courses of the languages went by in a fast paced manner, without properly grasping it to a certain level where you feel satisfied with the language.

My question is, is it a better idea to completely master 1 or 2 language to the "expertise" level (like for example C++ & Python) or learn several languages (more than 4) at an intermediary level giving them equal time, with a aim to be proficient in multiple-languages?

What impact would either of the decision have on a person's job and career?

I'm really interested in learning C++ and mastering it to the expertise level where I can do pretty much anything without having to think twice.