I'd add that spending some time to play with the languages that are hard or different will pay dividends down the road.

Learning some Haskell was probably the most worthwhile time I have spent learning a language because it forced me to fundamentally reevaluate how I think about programming. Now I don't use Haskell at work, and likely never will; but, years later, the techniques I learned from it I still apply daily when I write C, Python, JS or whatever. It made my code far cleaner.