When you become not satisfied with your current 2years job, how should you do?

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Recently, I have been growing tired of my current job as an sales assistant. Day and day trivial but no essential affairs, providing support to other team members at any time. I felt myself more and more like a nanny of them. I think my responsibility is just to do the work which waste time and have low level of importance. Actually, i have good academic background, better than other colleague. I joined in this company directly after graduation.In fact, i kept learning everything carefully on the work. Recently, i started to have the idea of changing my position within the company, to do sales management job.But i also know that the headcount of this position is already enough. It means that if i want to change within the company, maybe a long period of time i should wait for. In the last few days, this matter has always made me upset, i don't know how to make my career path better. Friends on mylot, if you were me, how should you do? Quit or stay for the chance?