I'm in the US and need emergency pet care for a kitten and don't know how to pay for it

I found it caught in a loose string wrapped around it's leg and released it. After a couple days I've noticed it's been chewing through it's leg, now, and it's in a lot of pain I'm sure. The mother won't care for it either.

These cats are wild and I can't seem to catch all of them before they start reproducing, for the past 2 years I have been spaying and neutering these cats, but more keep showing up.

I live out in the country in the US, and I haven't been able to get anyone to come take the cats, it's like I'm just stuck with them. A few of them are outdoor family cats, and we don't want to lose those.

I don't know what to do about any of it, I can't afford another pet bill right now, especially a bill for a kitten needing so much care. Any recommendations are appreciated. I live in KY, United States