You should pick JS, something server side (PHP, Ruby, Python, or Node.js) and react.
You'll spend a lot of time configuring libraries and services (webpack or webify) but that's just the way coding is these days. Anyone of us could code some assembler - like OP said, it's fun and easy. We teach our 14 years olds how to code assembler - it's that easy. You don't honestly think you can compete with those skills? You need to learn the hard stuff.
This is what you should do:
Learn all of the above Learn PhoneGap and cordova, use React to create an app. Pitch to companies to put an App out for their website. Use whatever server side tech they use (e.g. 90% of companies will be using PHP) to create a simple Web API for your app to call.