Help! I need to name my niche?

[Tonya P]

I am a writer who writes mostly for non profits but I don't want to limit myself. I have spent most of my career working for non profits but decided to take an new path to begin writing. The type of writing that I have done has been to help further the mission of those organizations whose values I respect. I thought of "social marketing writer" or "social change writer" but I'm not sold on one title yet. Can you help me to put a name on my niche?