Check your ground out thoroughly, if you can locate an earth or two, set out to rein these in first, as your learning the ground, if you can pick these off you’re save a hell of a lot running about after this years brood have starting to spread out and move on.
Find the earths - high seat set up

over the earths
On the earths, knock over the cubs first ( all of them) then the adults after, starting with the dog fox, the vixen is the key to getting the cubs out of the earth, just a little squeak from her and they will come out,some are full on some are timid so a accurate head count is essential, when you have shot a cub pick it up and hide it away the vixen will come into collect it after a head count and move the carcase to a safe place other wise and then probably out of a bolt hole from earth move the rest un seen it’s the best reduction you can get for the area for just a few weeks you know where they all going together
Stick with it and you can see the results pretty well
Good luck