Fundraising ideas for tiny nonprofits? Help!

For context: We are a very small nonprofit that focuses generally on cat rescue efforts. We are not a licensed rescue (do not adopt out animals under our org), just a nonprofit! We only have about $3k tops in our bank account at a time.

We have about a ~6 person active volunteer team, with 3 board members doing majority of the work.

A mass majority of our fundraising efforts are through individual cases that we create fundraisers for via Meta (Facebook & Instagram). For example we take on a case of a cat that needed emergency surgery, pay for it, and then create a Facebook fundraiser to cover those medical bills.

We only reach our fundraiser goals via social media about 50% of the time.

We have about 10 consistent monthly donors signed up via our website, and we bring in a very small amount through our merchandise.

My question is - what are your recommendations for a fundraising effort for organizations this small? We need more ways to pad our funds so in case of emergency we aren’t left with $0 in our account. We truly put every penny we make directly back into our mission. Our team is small and we don’t have a ton of “spend money to make money” funds to host events to fundraise.

Open to any and all ideas!