Give me some time. Seeing as I've never shot sports, much less v-ball...I'm working on it.
As far as the framing, I can't win for losing. I cropped away plenty of area, because on my last series commenters said I left too much in the picture. Now I cut out the excess, and I'm dinged for that.
Thank god the parents are a little more forgiving!
Don't take it personally.
I don't follow individuals so I have no idea what you did before and my comments are what I see in the pictures as presented.
I've never shot volleyball but I've shot a lot of plays and my behavior there might be of some use.
I watch a rehearsal and look for parts where the action is particularly 'photographable' and make mental notes.
Then when I'm actually going to shoot, I prepare myself and the camera for that kind of shot, change angle, get f stop and shutter speed ready, etc.
In volleyball, most of the time the action is fast but also, most of the time, the interest is where the ball is, so set up to shoot when the ball and the person meets. When you get enough of those kinds of shots, the 'money shots', then you can let your camera roam and get person shots, the kinds of shots mommys' love.
Re '
trimming away space' doesn't mean arbitrarily cutting off emptiness; it means getting the important stuff in important places in the image and then framing around that.
You don't need to include the entire bodies of players irrelevant to the action, get the action on the money shots and get the players at other times.
(If you crop to a non-standard dimension, always give the purchaser an image with space added so It will print on a standard size and fit easily into a standard frame. No one wants to buy/get a semi-casual picture that requires a $80 framing job just to stand on a table)
Re

arents are more forgiving. Most parents are just ecstatic to see their kids in the frame and in focus. Don't use them as a measure of how good your shots are.
To quote Gene Wilder in
Blazing Saddles:"You've got to remember that these are just simple farmers. These are people of the land. The common clay of the new West. You know... morons. "