Coyotes have also been known to climb chain link fences. If it were me looking for advice I would post photos of the area you're keeping the birds in to give us a better picture of what is actually happening. You haven't really given people much to work with in the way of information.
I grew up in East Texas on 113 acres and there are a variety of predators that could be preying on your flock; coyotes, foxes, bobcats, wild dogs, snakes, rats, hawks, owls, raccoons, and even wild hogs can all prey on them.
You need to look at keeping the birds safe at night. Fifteen years ago when I lived in Palestine and worked for a hobby farm between myself and them I looked after nearly 2000 birds. All the fencing was five foot welded wire held by t-posts. Breeding pens were placed strategically so that fencing was shared between pens. Houses were built like the one seen here:
https://www.backyardchickens.com/threads/nearly-done.1292803/
I modified it slightly, but the point is that the birds were locked up in those houses over night and let out in the morning to be in their runs during the day. In the evening various breed pens were turned out to enjoy free-ranging for a couple of hours before bed.
I had three dogs at my home growing up but still occasionally lost birds. My father didn't support my hobby enough to ensure that the birds had the best housing/caging. At least losses were small though. The hobby farm didn't have a dog roaming the property and their losses were practically non existent. There were occasional problems with snakes eating eggs. And a large boar raccoon once killed multiple turkey poults before we determined where he was living and eliminated him.
But my point is you need to streamline everything. Don't have pens scattered about and avoid placing them under fruiting trees such as persimmons, which raccoons and coyotes both enjoy. Build them all in a row, or two rows back to back to utilize the same wire and build the pens less expensively. I will see if I can find some more photos of the older set-ups to give you a better idea of what can be done.
Ultimately providing housing for the birds that they can sleep safely in overnight, like the one linked above is going to be one of the best things you can do. If you can't provide a safe home for the remaining birds you have you'll find yourself out of the chicken business altogether.
