Sometimes it is the simplest of things which take an urban Church from "marginal" to "thriving". A good example is a Roman Catholic Church I attended (occasionally) for many years. The Church, under a new priest, was suddenly thriving. I could see only two significant changes. The new priest, unlike the old, did not dominate the services on a Sunday. He drew on the whole congregation to take part. And the new priest, unlike the old, preached his sermons with conviction. However, he preached from the same stock of sermons! Strangely, as best I know, he gave the congregation less attention. OBSERVATION: "Drawing from the congregation" is not, however, "ministry by members". It is not Congregationalism. Even Congregational Churches get muddled with this, sometimes.