Abram puts his inheritance at risk by offering half of it to Lot. Lot could have the north or the south of Canaan to his nephew. Instead, Lot goes east (never a good direction to travel) to the lush Edenic valleys of Sodom, where the wicked live. And we're given advance notice of Sodom's fall. Seemingly he has learned nothing from Egypt, of the dangers of living with the serpent's seed. Alarm bells should be ringing but off he goes.
Waiting is rough in the short term. Lot divides from Abram and goes for Heaven on Earth – he wants to make his own way back into Eden, rather than waiting for Abram’s Offspring to lead his people back in and defeat the serpent. He walks away from the blessed family and their promised inheritance. Matthew Henry notes: "Lot had the paradise, such as it was, but Abram had the promise".
Abram remains in the land and has the promises renewed while he waits in the dusty post-famine land of Canaan. He’ll have more descendents than the dust in the land. And so he continues to establish the worship of the LORD in this land. Daily as he waits the dust on his feet will prophesy to him of God's great promises.