Jesus told His disciples to meet Him on a mountain, and there He gave them a special job to do.
"Go into all the world," said Jesus, "and tell everyone the good news. Teach others how to be My disciples. Show them how to do the things that I have taught you. And baptize them in the name of the Father and of the Son and of the Holy Spirit.
"And remember this: I will always be with you - even to the very end of time.
The New Kingdom
Jesus is king. He was rejected by the world, but it was never up to the world to appoint Jesus king. It was up to God, and the Father has made Jesus King of kings and Lord of lords.
Everyone who believes in God is a kingdom ambassador who can tell others about our great King until the whole world has heard.