“Cast your burden on the LORD, and he will sustain you; he will never permit the righteous to be moved.”
"Cast" is a physical word — a deliberate throw, not a polite mention. God invites you to transfer the weight, not just describe it.
The promise is precise: He will sustain you — the person, not always the plan. Some burdens lift; in others, He carries the carrier.
David wrote Psalm 55 wounded by a close friend. Even the burdens other people place on you can be cast on the Lord.
Most of us cast our burden at night and collect it again by morning. Casting is a habit to repeat, not a ceremony performed once.
He will never permit the righteous to be moved. Your footing rests on His grip, not on the strength of yours.
Act: before breakfast, write your heaviest burden on a slip of paper, hold it in open hands, and pray it over to God.