I have programmed in lots of languages over a couple of decades long career, including FORTRAN and COBOL, etc. But I wouldn't consider myself to be a polyglot -

I have programmed in lots of languages over a couple of decades long career, including FORTRAN and COBOL, etc. But I wouldn't consider myself to be a polyglot - I only consider myself reasonable with C, JS and Python. It is my ability to fully comprehend requirements, design solutions, document everything that is the core of my success. Whether I write much code or act as a team leader is a project specific issue. I hold very serious concerns about any project that requires the use of 6+ languages. Even in an enterprise setting with lots of legacy systems, I would expect different people to be competent with subsets of all the languages in use. Go is an excellent language with a rapidly growing ecosystem. It might be a good strategy for you to be known as the Go expert instead of a jack of all languages who is not an expert in any of them. Besides it is not the language, it is the libraries, the tools and the ecosystem that takes a lot of effort to be competent with.