Here is a quote from Martyn Lloyd Jones on the best means of evangelism:
what the Church needs to do is not to organize evangelistic campaigns to attract outside people, but to begin herself to live the Christian life. If she did that, men and women would be crowding into our buildings. They would say, ‘What is the secret of this?
Brothers and sisters, if we want to advance the kingdom of God, we must live holy lives. We must cultivate lifestyles of humble dependence on Jesus, loving God and loving others in the power of the Holy Spirit. We must become the people that Jesus describes in Matthew 5:3-12.
Source: Martyn Lloyd Jones, Studies in the Sermon on the Mount, p.13