Linux.com - https://www.linux.com/news/programming-languages-you-should-learn-now
Learning a programming language is not hard. In fact, if you’re experienced, you can learn the basics in under 24 hours. So if you’re in the market for a new lingua franca, such as to bolster your hirability, what you choose next might be influenced by your current language of choice.
Here are the languages I suggest you consider learning if you don’t already know them, based on the languages you already know.