they need more watch towers or some type of platforms that are only just on the inside of the walls so they can see over the walls, with people with snipers or long range rifles in them. they need to cut down the trees that are outside of the walls, so they can see any threat coming a mile away. they should all be trained with guns and weapons, and everyone's weapon/s should be kept with them. they should all have communication devices, and in case of some big emergency, an alarm to wake everyone up, weapons ready. all of the houses windows on ground level should be boarded up in case there is another murderous human group who invades. even if the human invaders are killed, a part of the wall might be destroyed, and there could be a large horde of zombies that get through before they get a chance to fix the wall, and people would have to escape to their homes quickly. from inside their homes, they should make it so it's easy to get onto the roofs of the houses, where they can shoot the zombies, or any human invaders. in case there are too many zombies, and not enough bullets, they should have some type of long spear to stab the zombies in their heads, from the roof
