I recommend JavaScript. Finding contractor work should be fairly easy if you are able to build web applications. In addition, learn Node so you can write backends for those web apps in JavaScript as well.

When I was in school I focused primarily becoming proficient at Python, as I thought that was the language that would land me a decent career. Since I am mostly interested in web programming, I found myself building backends in Python - but always ended up still using a ton of JavaScript. When I switched my focus to being primarily a JavaScript developer, I ended up finding a ton of work and that is still the case to this day (5-6 years later).