HELP FOR THE EXPENSES OF MY RESCUE CATS

I often rescue cats that are thrown away by someone usually on our yard. I'm only self-employed so I don't have much money and it mostly goes to the food and other necessities of my cats. I adopted 5 of my rescues and only fostered the others for few weeks and find someone who can take them in (which is really hard to find coz the cats are not pure breeds) since it's really hard for me to add more cats at home. I really need help so I can continue taking care of them and helping other thrown cats that I could find. I might be crazy for keeping them even if I'm not rich but would you be able to sleep hearing newborn cats outside you house without their mothers or think nothing when you see a stray kitty eating dirt because it's hungry? I would really greatly appreciate any amount you could give for the cats.