Micah 4:12 But they do not know the thoughts of the Lord, Nor do they understand His counsel; For He will gather them like sheaves to the threshing floor.
God does not think in the same way as we do. He is not limited to the way we think. And His thoughts are certainly not trapped by the same sin as ours are!
When God asks us to do something or say He will do something. We are not to limit His ways to our own thoughts because nothing is impossible through Him.
When God is ready, He will bring in the harvest and not us; we should just continue to try and tell others about Him.