Sorry to hear about the influx. We, like
@oosik gave up gardening when the ground squirrels (our nemesis here) got too invasive.
Our orchard now has a low HDPE fence and electric netting that combined seems to deter them. I know that I should really trench down 18" and put wire mesh in, but somehow it never rises to the top of my do list.
This year we are awash in mice for some reason. Normally the cats keep them away between the feline scent and predation.
Ferret? Dedicated Jack Russel? Adopt a badger?
Good luck.
All the best,
Peter