It is only one thing that man needs is victory over the world. How?

Have faith in Jesus Christ. How? By believing that Jesus Christ is the Son of God.

Also, remember what the Bible said, especially to this who have a little faith in Him: Jesus told His followers, "Go everywhere in the world.

Tell the Good News to everyone. Whoever believes and is baptized will be saved. But those who do not believe will be judged guilty.