Genesis 11
[31]One day Terah took his son Abram, his daughter-in-law Sarai (his son Abram’s wife), and his grandson Lot (his son Haran’s child) and moved away from Ur of the Chaldeans. He was headed for the land of Canaan, but they stopped at Haran and settled there.
Genesis 12:1,6-7
[1]The lord had said to Abram, “Leave your native country, your relatives, and your father’s family, and go to the land that I will show you.
[6]Abram traveled through the land as far as Shechem. There he set up camp beside the oak of Moreh. At that time, the area was inhabited by Canaanites.
[7]Then the lord appeared to Abram and said, “I will give this land to your descendants.” And Abram built an altar there and dedicated it to the lord, who had appeared to him.
Terah, the father of Abraham saw the vision God had for his son Abraham, which made him try to fulfill it, but he could not, so he prepared him for it, by drawing him closer to it.
When it was time, God unveiled the vision to Abraham. He did exactly what God told him to do, then five generations after, the vision and promises were fulfilled, through Joshuah.

The vision and promises the your ancestors had with God and preparations they have done, it is time for you to fulfil it. The Joshua of the vision and promises

Deuteronomy 31
[3]But the lord your God himself will cross over ahead of you. He will destroy the nations living there, and you will take possession of their land. Joshua will lead you across the river, just as the lord promised.
Joshua 6
[27]So the lord was with Joshua, and his reputation spread throughout the land.