“Then the disciples went out and preached everywhere, and the Lord worked with them and confirmed his word by the signs that accompanied it.” (Mark 16:20 NIV)
The apostle Paul said, “Be ye followers (imitators) of me, even as I also am of Christ.” (I Cor. 11:1 KJV)
“My message and my preaching were not with wise and persuasive words, but with a demonstration of the Spirit’s power, so that your faith might not rest on human wisdom, but on God’s power.” (I Cor. 2:4-5 NIV)
“… by the power of signs and miracles, through the power of His Spirit. So from Jerusalem all the way around to Illyricum, I have fully proclaimed the gospel of Christ.” (Rom. 15:19 NIV)
Demonstration of God’s power = signs and miracles. Without that, the gospel has not been fully proclaimed. You may be following the wrong example.