I'd say improve your JS skills, if your aim is to work as a web developer then that's where things are going. Get your head around some JS framework like AngularJS or backbone. Alternatively, Ruby always comes in handy (have a look at Sinatra first before you jump onto Rails). Alternatively, Python is useful, too, though I guess it's not the primary choice when it comes to web development (have a look at Python flask). hope this helps.