We lost several chickens this year to predators so no more free roaming. My old run was too small for the flock so I fenced in what used to be our garden and turned it over to the dinosaurs. The old run will accommodate our pullets until they are bigger and can run with the rest of the herd.
Sorry to hear about your chickens. Depending on the predators in your area you may want to consider if covering the top somehow as well is appropriate, if you haven't yet. Many are shockingly good jumpers, and with determination might get in.
I have thought about it, I'm considering adding netting but what I've looked at is pretty expensive for the area I've fenced in plus I would need to come up with supports, either wood or possibly pvc or metal hoops. In trying to keep this as low cost as possible considering I've already spent a couple thousand on this project in the 2 years I've owned chickens. Buying eggs at the store is far more practical.