I didn't see PHP mentioned here, so I just want to throw out there that you shouldn't underestimate how much legacy PHP code is out there to be maintained.
I think Python and Ruby both make you pretty employable, as well, and I prefer to work in those. But on the web, you're going to have to learn Javascript anyway, so might as well start with it.
And then pick up a framework, keeping in mind that these frameworks are pretty complex; probably inscrutable to people without some coding experience, even if it were in another language.
You'll need to learn Vanilla JS before diving into a library like React, Anular, Vue, etc. At the end of the day, you're still writing JavaScript.
You could get a job with just JS knowledge, but you'll have a lot more luck with a popular framework/library stack.