If you are starting to feel more comfortable coding in js, the next thing you want to start learning is Ajax and start building some simple app that implements APIs such as Google map or YouTube player.
You want to start learning the asynchronous nature of the language, cuz that's gonna be your life as a js developer better master it before anything else.
I don't recommend learning any framework at this point, the "make your life easier" part of any framework is just gonna stop you from truly mastering the language. ( I still got friends who can't make proper DOM manipulation without jqeury)