I have a very deep understanding of html/css and I know enough jQuery/JavaScript to handle DOM manipulation, as well as build out image sliders, tabbed content areas, etc. etc. I am also very knowledgeable about WordPress. As far as locations go, I live in the central US and won't be moving to San Francisco, New York City or any other large coastal city. Taking that into consideration, 100k would be considered more in the central US than somewhere like San Francisco.
Basically, I see two options. The first option is to start learning a backend language, something like Ruby/C# and hoping for the best. I seriously doubt I could get enough experience learning a new language part time though. My second option is to really start focusing on MVC JavaScript frameworks and becoming proficient in something like Backbone or Angular.
Are those my only two realistic options? If so, are there any recommendations on which route I should go or any general advice?