I agree with those who have suggested starting a Patreon since you already have a large network.

In addition to that, however, I would suggest seeking out sponsorships with companies who have complimentary missions and values as your podcast, or products that can serve your listeners. Since you're a social enterprise, there may be grants out there too that would fund the kind of work you are doing.

If I knew more about your show, I could suggest some examples of potential sponsors I would approach. I'd also be interested in listening to your show as well! :)