so i know house cats being let outdoors is a huge issue and owners should be made aware of this - many may not realize the gravity of their decision. i think, however, going after feral cat populations may have the most significant effect. you could look for trap-neuter-return programs in your area and support those efforts. it isn't the instant results you may be looking for, but i think it's probably the most humane response likely to show positive long-term results outside of finding a program that puts the cats into a sanctuary (trap-neuter-remove). while this would be preferable, those programs seem much rarer.

otherwise, on an individual level, assuming you are a home owner, you could create feeding areas that are safe for birds - fenced off from cats with shrubbery and/or dead hedges for added safety.

and while you're at it, don't forget to make homes bird-friendly by addressing outdoor lighting and windows so birds can safely migrate and avoid window collisions.

bird friendly homes | u.s. fish and wildlife service

anyway, that's my two cents. interested in any other ideas yall may have.