As mentioned, maybe shoot a little looser, and crop in later. I think some of these show too much noise reduction, which lowers the feeling of seeing reality, of being there, so I'd consider less aggressive NR. I prefer to see the high-frequency, small detail that makes things look REAL, rather than a smoothed image. Keep the camera more level if possible.
I pulled a few of these onto the desktop and opened them; these are scaled a bit too large to down-rezz in my browser; a coupl;e of the images I looked at looked like missed focus when seen in this window, but when opened up and seen full-sized looked sharp, so if you DO show these on-line, consider scaling them down to a smaller size, like say 1,200 pixels on the long axis.
As far as getting better: hills and plateaus, hills and plateaus! You probably just need to shoot more, and for a longer time frame, and then you'll climb another hill. These mostly look "okay", but not great, not spectacular. There ae a number of shots that need to be cropped a bit, to eliminate unused space, or to better balance the image.
Gonna suggest being very aware of framing and 1) tall vs horizontal camera orientation, and of using the lens at say, 2)150mm and of following the action more so than zooming and reframing all the time 3)keeping the camera level. I think keeping the lens "mostly" the one focal length, a bit shorter than maximum, will help on multiple fronts: framing, leveling, and timing of action and following the game and being READY when something happens.
