I learned a lot from a project on Github (https://github.com/braitsch/node-login) and taking a look at his code. I particularly liked the way he organized his project and the way he wrote his controllers. I was learning Node when I originally went over it, but I began writing my JS similar to how he wrote his. My code became more object-oriented.
Douglas Crockford has some great videos on javascrip: https://www.google.com/search?q=douglas+crockford&safe=off&e...
I highly recommend 'Secrets of JavaScript Ninja'[1] for learning intermediate/advanced topics of JS. The book is written by John Resig (creator of jQuery) and Bear Bibeault
[1] http://www.amazon.com/Secrets-JavaScript-Ninja-John-Resig/dp...
This series, https://github.com/getify/You-Dont-Know-JS has been good for learning the nuances of javascript.
Define "using JS for years" It is a relatively small language, how haven't you become highly proficient in it yet?
Nodevember Videos about PROMISE object - https://www.youtube.com/watch?v=oa2clhsYIDY
Nodevember Videos has interesting session on ES6 (ECMAScript 6 spec discussion), this is learning about the future. https://www.youtube.com/watch?v=Hjkc9m9vYCU
JS Design Pattern book (I refer to it quite regularly) - http://addyosmani.com/resources/essentialjsdesignpatterns/bo...
Eloquent Javascript (First book I read after working for few months on JS) - http://eloquentjavascript.net/
Additionally - read the specification always helps - this is the draft of ES6 (http://www.ecma-international.org/publications/files/ECMA-ST...)
Also, if you want to learn pure JAVASCRIPT, I presume you should also work on NODE.JS because JAVASCRIPT has evolved big time in the past few years to become "THE" Language.
Recent conference (NODEVEMBER) has lot of interesting videos - https://www.youtube.com/channel/UC7z0nOE8ITfrGnXJgNzYaEQ