Actually the world is much smaller now. Back when the call was given, it would have taken you over a year to travel to the other side of the world. And the risk would have been much greater.
The call is still valid. If you are in a lifeboat dont you risk your life pulling others from the water? If you dont, your life is not worth saving anyway...
How big was that world? It didn’t take in Asia, Australia, North & South America.
If you are in a lifeboat, do you sail it to the other side of the world to pick up people?
Are the people in your backyard not worth saving?
Jesus never tried to convert anyone.