Reviving a Plumeria with root rot can be challenging, but it is possible with prompt action. If you suspect root rot, remove the plant from the soil, and inspect the roots. Trim away any dark or mushy roots and let the plant dry out for a few days. Repot the plant in fresh, well-draining soil and avoid overwatering. Consider using a root rot treatment or fungicide to control the infection. Place the plant in a warm, bright location, and monitor it closely for signs of recovery. Adjust your watering routine to prevent further root rot and support the plant’s recovery.