Upload & Sell: Off
I've only shot little league games, but I have a couple of comments.
First, you have a couple shots where it is clear that the batter is not swinging at the pitch. I don't think those shots are going to sell. Parents want to see action of their kids, but action that is of their child "succeeding" and not "failing." No one wants to buy an image of their child failing to do something or even worse, showing their kid failing at something they are doing. Images of swings and misses, or just letting balls past are "failures" and they won't sell as well as a shot of "success". Obviously we all love to get the perfect shot of the bat on ball, but I think the second best shot is with the player swinging and the ball out in front of the plate. The player may have swung and missed, but with the ball out in front of the plate, it sells the idea that the kid hit the ball vs a ball behind the batter or an image with the kid not swinging at all. You can sell the idea of "success" in an image where you capture the action just before the actual success/failure point. But if you capture the action after that success/failure point, then it is clear if the kid failed (ie swinging and missing, not beating a ball to the bag, missing the catch, etc, etc, etc).
This does mean that the in camera crop cannot usually be a close as these images however. You need to take the images with enough space to capture the action. You can always crop down a little in post to get the perfect image. Obviously we cannot tell how you are shooting these images - if they are SOOC or cropped. But if they are SOOC, I would suggest shooting a little wider to allow a greater chance of catching the right action and allowing yourself the ability to crop it closer in PP. If you shoot too tight in camera, you greatly reduce your chances of getting the best action/crop.
For example, image #5 is a bad crop IMHO. The batter should be in the left 1/3 rather than center/right. If this is out of camera, you have no way of correcting the crop. If you shoot a little wider, then you can crop in PP and get a much more compelling image.