The promise doesn't shift because the problem looks big. If God is with you, the land is already yours.

“And we know that all things work together for good to those who love God, to those who are the called according to His purpose. For whom He foreknew, He also predestined to be conformed to the image of His Son, that He might be the firstborn among many brethren. Moreover whom He predestined, these He also called; whom He called, these He also justified; and whom He justified, these He also glorified.”

Romans 8:28-30 NKJV

'Then Elijah said to Ahab, “Go get something to eat and drink, for I hear a mighty rainstorm coming!” So Ahab went to eat and drink. But Elijah climbed to the top of Mount Carmel and bowed low to the ground and prayed with his face between his knees. Then he said to his servant, “Go and look out toward the sea.” The servant went and looked, then returned to Elijah and said, “I didn’t see anything.” Seven times Elijah told him to go and look. Finally the seventh time, his servant told him, “I saw a little cloud about the size of a man’s hand rising from the sea.” Then Elijah shouted, “Hurry to Ahab and tell him, ‘Climb into your chariot and go back home. If you don’t hurry, the rain will stop you!’” '

1 Kings 18:41-44