Why is my coleus dying and what can I do to save it?

Coleus plants may be dying due to overwatering, underwatering, lack of sunlight, or pests. To save a dying coleus, ensure it is receiving the right amount of water, sunlight, and nutrients. Trim off any dead or yellowing leaves, and treat any pests that may be present. Repotting the plant in fresh soil can also help revive it.