How do you take javascript to the next level ?

How do you take javascript to the next level ?

Hey guys , I just had a weird question pop-up in my mind and taught i'd ask on here ! , I remember about a year back me start off with the intent learning of javascript  , i can atleast say now that i can write 10 lines of JS without hitting a wall , that's an achievement for me , I have tried to build a couple of run-of-the-mill plugins such as carousal , typing animation plugins and it was quite fun and gave me alot of insight into how JS was written and used in web development . 

It was Fun learning to build plugins , although they vary in complexity.(some can really be a thousand lines of code , and seem like a entire piece of software all by them self. ) , But i was just wondering , WHAT NEXT ? what more can you do with JS than build just plugins for the web ?. 

I few prospects could be NODE.js , angular.js ,  backbone.js , now i am mostly a frontend guy , and i would't opt for NODE.js as it does't seem beginer friendly. angular might be more of a practical option , also  a SVG framework might be great to learn , but again that's not so practical as SVG is fancy but most frontend JOB's don't ask for it as an absolute requirement. 

So i'am still confused , how do i take JS to the next LEVEL ?