Why is my cactus wilting and how can I revive a wilted cactus?

Your cactus may be wilting due to overwatering, underwatering, or poor soil drainage. To revive a wilted cactus, carefully assess its watering needs and adjust accordingly. Ensure the soil is well-draining and consider repotting if necessary. Place the cactus in a location with adequate sunlight and avoid overwatering in the future.