My personal opinion is that you'll find it most rewarding to locate a non-profit near you that supports a cause that you support and to volunteer to help them w

My personal opinion is that you'll find it most rewarding to locate a non-profit near you that supports a cause that you support and to volunteer to help them with various tech/data projects as a way to improve their service delivery. They don't have to be working with a local beneficiary community -- perhaps they support something overseas. Instead of skipping off of the top of a lot of different projects, it will give you the opportunity to dig deep into the needs of one organization and potentially have very significant impact on the way they conduct their work. Just keep in mind that they're the SMEs with regards to the beneficiaries and that you're there to support their needs, perceived or real.