bullsh it
if you knew java, C++ and sql fluently then you wouldn't have to ask what language to learn next
you would be familiar enough with computers and programming that you would already know what you should learn next
doing the tutorials at codeschool and w3schools doesn't make you proficient
it barely makes you a beginner
you're like a wannabe chef who says "I'm skilled at braising, roasting and frying. What should I learn next"
LOL, if you were skilled at those things then you would KNOW what you should learn next
here, sign up for Harvard's Introduction to Computer Science course
https://www.edx.org/course/introduction-computer-science-harvardx-cs50x
it's free
try to learn how to write a linked list, a hash table and a trie in C
then you'll realize that you don't know a damn thing