You already have the lens speed you need for sports, you can't really do any better in a zoom lens.
What you need is a newer body with a better sensor.
As the D7500 supposedly has the same sensor as the D500, that is what I would suggest. They both have the Nikon "flicker reduction" system which makes a huge difference if you have to deal with crappy mercury vapor lighting. I changed from the D300s (roughly contemporary to the D7000) and the D500 in low light is on a whole different plane.
VR is useless for sports/action, as you have to turn it off to track moving subjects. You need adequate ISO speed to get sufficient shutter speed for your lens and action, no way around that. You
can do football as slow as 1/250 from a monopod (or if you're
really steady) but at a practical level you want 1/500. With the D500... ISO 12500 is not even breaking a sweat so 1/500 or more is available even in poor light. Tonight I was shooting at 1/800, f4 and letting auto iso figure it out as the game started before sundown.
Once you get a new body, do autofocus fine tune on your lenses, it makes a
huge difference when shooting at wide apertures. The newer AF systems are faster and more accurate in low light also, I shoot wide open at 2.8 (or 4 depending on the lens) and it's right there. With the extra camera speed I've been shooting some football with a 100-300f4 (that I got used at a really good price
).