Prospect Ceres
We already know there are interesting materials there.
Cool. Let's prove it. Send a mission there that can land, sample, and return those samples' analysis back.
Based on those results be ready to send a AI powered probe to also land on Ceres, its mission is to create fuel for its return. That's the first resource, right? More juice? Can't do anything serious out there without energy. Do the experiments. Go for it.