Certified GKH Gardening Expert
You need to determine if it is still alive. This article will help you determine that: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm If it is still alive, just give it some time and it will regrow its leaves. Keep a close eye on it during this time, as trees are more susceptible to disease and pests when stressed liked this. If you see signs of disease or pests, treat the tree for them ASAP.