One way is church planting. Church planting is the Book of Acts' way of fulfilling the Great Commission. Wherever the gospel was proclaimed, a church was formed. The fruit of the gospel must be preserved, and that is done through the local church. We need both types of churches.
Church planting is the most effective form of evangelism as far as reaching new people.
It's dramatic the number of souls that come to Jesus Christ for the dollar invested. We've found that church plants can be very effective in reaching targeted segments of the population. We have church planters reaching certain ethnic groups, certain age groups, etc. We've found this to be effective because it flows out of who we are instead of trying to fit some preconceived idea of what church should be like. We need to think saturation, not competition.