Now, I am not naive. I understand that the exposure a problem gets is influenced by various political, economic, and social factors, the least of which is the number of people actually affected by the issue. So, what I am asking is: what are the most effective and realistic ways to get people to care without political power, fame, or wealth? How can an ordinary person make a difference?
Yes, you could call the 1993 intervention in Somalia an exception. But note both the context - trends in World Events were looking very utopian back then, vs. now - and just how badly that Western intervention turned out.
With "ordinary person" resources, I'd suggest that you start by trying to document & organize the historical facts about what's happening. That at least improves the records of the tragedy, and of the people and things being lost. While helping you network with other people who really care. And perhaps, just perhaps, that can grow into some real improvement in things. And hopefully the history that you help document can be more than a thin comfort to the survivors and boon to future historians. Try to make it both an easy & authoritative resource for any mainstream Western journalists & activists who get interested, and also useful to any mostly-well-intended Western leaders who want to Do Something. Hopefully without botching it again.
I am sorry that the beautiful people of Sudan are experiencing this conflict. I hope that the better side of humanity will bring it to an end soon.
― Antoine de Saint-Exupéry
Well, there's your problem.