Hi and welcome, first question really is what do you like took shoot, I've looked at your flickr page but TBH there's very little there to see it looks like you like architecture so the kit you have is probably just about right
I would not consider getting new kit until you have learnt more about the camera as you can see I shoot with the next gen. version of your camera and you can get some stunning results with cameras at our level, and splurging on new kit will not improve your photography till you understand the fundamentals
Don't be afraid to post for critique, there's nothing better than good honest critique for improving your photography
Matt
MWHCVT