If you don't feel you are missing something, or can't see what you are missing with the equipment you got, I would spend it on courses and traveling. Actually get out and use what you've got.

If you want new equipment, you might want to look at:
Zoom: Canon 70-200mm F4.0 USM (no IS). Is is an inexpencive, sharp and surprisingly light telezoom lens.
Primes for ex. low light and steet photography:Canon 50mm F1.4 or Canon 35mm F2.0
A cheap flash like YN-560 for low light photography