…as, which you either learn to avoid, or are inclined to avoid such corner cases in the first place, I can recommend JS for career switchers because you can use it on the web, on the mobile (e.g. React Native, Ejecta, and a range of application frameworks), on the server (node, nashorn, and embedded JS in various places) and all mainstream desktop OSes (e.g. via Electron). Its domains of use are also broad: there are brain visualization software, games, financial applications, web sites, web applications, animation, art, data visualization, you name it.
There are many languages that can be used in many different application domains. For example, Smalltalk can be used on the web, on mobile, on the server, on desktop…practically everywhere! Smalltalk can be used for numerical computing, machine learning, natural language processing, data visualization, virtual reality, robotics, Internet of Things, ERP. Smalltalk is being used to fight Ebola! However, even I wouldn’t claim that Smalltalk is a popular language.