Evangelization is a light, a gift, and guidance. The Church is not an establishment whose goal is to expand. The Church is the Truth that begs to spread. Everyone who receives it keeps it as a treasure in himself and has the duty to make it spread. The history of missions and evangelism in Russia in the first millenium after Christ testifies that the first converts to Christianity went immediately to preach others.
Evangelism is accomplished in many ways.
The first is the external way, mentioned above as mission to the world. The second is the internal way, within the Church. St. John of Kronstadt was dreaming in his childhood about going to the land of China to evangelize. But when he entered the theological school to prepare himself for this mission, he discovered that his parents and neighborhood are in bad need for evangelism. The internal evangelism is important.