Did you know there's a difference between being busy and being fruitful? Did you ever stop to think that just being busy - running around in circles all day but not accomplishing anything - is the same as wasting your time? It's frustrating to expend so much energy and time and not have any fruit from your effort!
I was always telling myself I could handle a more complex role, I could handle something bigger and more interesting than the work I was doing. But I wasn't demanding that of myself. At a certain point, I realized it was never going to come my way unless I started taking more control of it. That's what I realized I had to do.