Keep shooting primes would be my advice. They'll push your composition skills and make you really understand different focal lengths much more than zooms. Even pros that use zooms (depending on what you're shooting) are doing so on full frame sensors with depth of field usually approaching wide open primes on crop cameras.
Zooms are good for convenience but primes will push your photography more. Once you have a mastery of the fundamentals consider zooms, but in my opinion the ultra wide and telephoto ranges are the only ones that require zooms due to dramatic perspective shifts on the wide end or the sheer impracticality of moving physically at the telephoto (100mm+) end. the 17-55 crop range or 24-75 35mm range is covered more than adequately with primes and on a crop I'd want all the DoF control I can get.
I assume you're thinking a 50 1.8 is limiting you, but I'd spend the money on a Sigma 30 1.4 and reconsider your stance on primes as the 80mm equivalent focal length (what the 50 1.8 gets on a crop) is definitely limiting in and of itself as it's a specialist sort of range, only really consistently useful for portraits