10 years ago I left Uni knowing only Java today write mostly C#. I hope it's not to unkind to say: if you're doing something purely to boost your job prospects then you're doing the wrong thing. Try both! If you get the taste of one over the other then go with it! Get impassioned; write more code. Put your code out there on GitHub or whatever. Yeah nobody will take any notice, but one day a potential employer will do some homework and look you up. Let them say: there's a motivated individual that I want on my team! Good luck to you!

I strongly recommend MIT 6.001 Structure and Interpretation (1986) https://youtu.be/2Op3QLzMgSY This course on programming (presented almost entirely on a blackboard) illuminated to me an entirely different way of thinking about programs. I can honestly say that I now write better javascript because I watched this series. Lisp may not be hip and all those parens can be a little jarring at first, but there is a beauty and a purity in the symbols and minimal syntax that will forever be comforting to me; those big cushy parens!