There are constraints on what counts as "Reformed. " It's more than a name or a label. It's about belonging to a particular theological stream or tradition, which is shaped in important respects by particular thinkers and their work, particular arguments and ideas, a particular community (especially, particular church communities, denominations, and so on), particular liturgies or ways of worshipping and living out the Christian life, and particular confessions that inform the practices of these communities.
I've observed over and over that people seem to get a much deeper sense of fulfillment out of something they've done as an act of service than out of the things they do for themselves.