Kuurt has a very interesting perspective that I can somewhat vouch for. I do Soul readings and negative energy clearings, and I have encountered many Souls that do not originate from Earth. They are indeed here to help raise the vibrations of this planet; and yes, do long to go "home". I've never heard about the "waves of volunteers" though, I'll have to check into that. If you have questions about your "purpose" here, I do a free energetic reading of your Divine Gifts, which essentially are the gifts that you where here to share (or not because you have free will to choose otherwise ;) )