Language is not just about a compiler and a better syntax, it is a huge ecosystem too, which either means a successful community(e.g. Python) or backed up by big guys(Google, Facebook,etc)
Life is short, for product development I am stuck with C, Python, Java, HTML/CSS/JS, SQL, that's about it and they're already more than I need and more than I can handle. Other than these obvious ones I may learn a little rust and dart in 2019, rust in particular seems interesting as a great fit to write standalone utilities.