Isaiah 19:21 And the Lord will make himself known

The rest of Isiaah 19:21 is superfluous, He will make Himself known to those whom He is calling.

Genesis 18:19 For I have chosen him, that he may command his children and his household after him to keep the way of the Lord by doing righteousness and justice, so that the Lord may bring to Abraham what he has promised him.

And what was that promise?

Genesis 12:3 I will bless those who bless you, and him who dishonors you I will curse, and in you all the families of the earth shall be blessed.”

We only need to wait on Him.

Isaiah 30:18 Therefore the Lord waits to be gracious to you, and therefore he exalts himself to show mercy to you. For the Lord is a God of justice; blessed are all those who wait for him.

So we wait.