Run a YouTube channel focusing on success stories. Show animals you have rescued. Show the work that goes into caring for them, and the happy lives they lead. Make it something an animal lover will want to see. Post regularly.
Then once or twice a year—but not all the time or it’d be too annoying-host a fundraiser to help pay for rescue work.
In other words let people feel involved through your channel and updates. Then they will be emotionally invested like you are, and pay to keep things going.