In Acts 9:32-35 it says,
Now it came to pass, as Peter went through all parts of the country, that he also came down to the saints who dwelt in Lydda. There he found a certain man named Aeneas, who had been bedridden eight years and was paralyzed. And Peter said to him, "Aeneas, Jesus the Christ heals you. Arise and make your bed." Then he arose immediately. So all who dwelt at Lydda and Sharon saw him and turned to the Lord.
Two entire cities turned to Christ because of one display of God's power! One man who had been paralyzed was healed by the Lord Jesus Christ, and two cities came to God.
We have the same gospel. It is the same Holy Spirit; we serve the same blessed Savior, Jesus Christ, who is the same yesterday, today, and forever. We have to pray that God will, if necessary, do the miraculous to save people.
Paul, writing in the book of Romans, says he fully preached the gospel with miracles, signs, and wonders. People will respond today just like they did then. But we need to be bold, step out, and pray for things to happen.
When I was living in Oregon, there was an Indian girl who was very sick and actually at the point of death. The doctors told her she was going to die. She came to a small meeting one night and the evangelist prayed for her. She was healed and then gave her life to Christ. As a result, her dad, a famous rodeo rider, got saved, and her mom was saved also. Then a large group of people from her tribe came to Christ as well.
Evangelism through power. We need to trust God for the supernatural.