depending on your jurisdiction, but especially in rural and farm areas you may be permitted to cull feral animals on your property.
In ecologically sensitive areas, (basically Islands, the Americas, Australia) cats are a invasive species, and put local small animal species in extreme danger. There may be a government program to assist in your effort. i.e. Australia's Cat Free Kangroo Island initiative https://conservationbytes.com/2021/05/20/killing-feral-cats-quickly-and-efficiently/