Mark 13:10 And the gospel must first be preached to all the nations.
When Christ began to tell the disciples of what was going to come, the tribulations and many other things He wanted them to know that the most important thing to start with was that the Gospel was preached to all nations.
No matter how close we get to the time when Christ is going to come back to earth we must always be focusing on the fact that the Gospel must first be preached to all the nations.
That means telling others of Jesus Christ first of all. That means not getting caught up in when the world will end but rather telling them of Jesus first of all. Nothing is more important than knowing about Jesus.