I'm so sorry for your loss. I know how heartbreaking it is to lose your first flock just after they are mature enough to be chickens. (We burned the coop down with our first from a flood lamp left in as the temps had taken a sudden cruel drop).
As to what to do next. First, it happens to nearly ALL of us at one time or another. That is simply farm life. It's not fun. It's simply the facts of living in areas with predators.
Next, see if you can figure out what got them. I see the one photo with a dead carcas and lots of feathers. Were their heads gone? Any bodies dragged off? My first thought is a coon. They can be very destructive.
Second is coop reinforcing. Hardware cloth is much more secure than chicken wire. Can you bury the cloth under the run wire?
You may also have to have a wooden frame coop, with a raised floor, and lock birds in at night if you are in a high predator area.
Part of figuring out how to proof the coop is figuring out what animal got them.
Again, I'm so sorry this happened. It often happens to the first flock. Sadly the learning curve can be high.
I have lost my first flock due to fire. I've also lost key hens over the years to coons. You learn. You improve. You learn to improve and roll with it while still missing your special first friends.
LofMc