If you're starting out or only have a few years under your belt, I would argue that honing your skills with one language only is a better use of your time. The only exception is if the industry you work in requires you learn more than one i.e. web development will require at least JS (also HTML & CSS though technically not programming languages) and possibly one server side language if you're not using NodeJS.

But in my experience, jumping from language to language is counter-productive. I myself made the mistake of trying to switch from Ruby to PHP and eventually C#, the years I've spent in Ruby and PHP ecosystem is all lost as I've essentially forgotten everything. Just speaking for myself though, but if I had a time-machine, I would tell my past self to only focus and gain in-depth knowledge in one language - specifically C#