Repentance for the forgiveness of sins will be preached in his name to all nations

Luke 24:44-53
He told them, “This is what is written: The Messiah will suffer and rise from the dead on the third day, and repentance for the forgiveness of sins will be preached in his name to all nations, beginning at Jerusalem.You are witnesses of these things.  I am going to send you what my Father has promised; but stay in the city until you have been clothed with power from on high.”
人要奉他的名傳悔改、赦罪的道，從耶路撒冷起直傳到萬邦
When he had led them out to the vicinity of Bethany, he lifted up his hands and blessed them. While he was blessing them, he left them and was taken up into heaven.
Then they worshiped him and returned to Jerusalem with great joy.  And they stayed continually at the temple,praising God.
Everything written about Jesus in the scriptures has been fulfilled. Now those who have witnessed these things must go out and tell the world that because of Jesus' suffering they can be forgiven. Jesus return to heaven closes Luke's chapter o his life on earth.
Luke compresses events. As he makes clear in his sequel -Acts - the ascension took place 40 days later.
Why?
Jesus has done his mission God send him come to the world to give good news to us.
We need to preach repentance for the forgiveness of sins in Jesus name to all nations.
How?
Dear Lord, please let me be a missionary of Gospel, to preach your good news to the world.