You need more fire ants. No lie. We let our yard ‘go’ one summer because we were too busy to do the fire ant treatment thing. We had more fire ant mounds than normal, but no chiggers, seed ticks and very few fleas on the doggos.
Until late last summer we’ve always had chickens. They may have kept them down.
Fortunately, fire ants are apparently not a kentucky thing, or not much of one. At last according to this:
Chigger removal by fire ant