That is the common amount you want.
What does the extra background add to the photo? IMHO nothing to the kids, so it is taking away from the kids then.
I can see the phone/power lines there or something, and what they add to the two kids with the faces and emotions?
The wooden support beams are interesting as the architecture, but they add nothing to the kids faces and emotions, but only to the location.
The group of adults behind adds that everyone is backs toward the kids, moving away. Giving impression like they are "walking away" from them, or that kids has turned away from the group for some reason.
But your crop is heavy anyways, as the cropped version leaves only really two elements to the photo, two kids and then group. And suddenly the under step water drain pipe becomes a third element, and draws attention. But it doesn't add anything to the kids, so it is taking away from it.
So I would do a closer a square cropping. Crop the yellow part of the top. Leaving the kids, group and the doorways on left/right intact. Now you have a three elements.
1) Kids with faces and emotions with movement toward viewer.
2) Group of people going somewhere else (conflict of motion of the kids)
3) Doorways to sides, offering "a way to go somewhere else".
If your subject is the kids, then your crop could be made little tighter as it is emotional tie to the kids, instead anything around them (and edit the pipe etc).
If your subject is something that happened and part of the place, make more square.
If your subject is the whole place (architecture, history etc) then don't crop.