One way to keep your Christmas tree alive longer is to make sure it has plenty of water. You should check the water level daily and add more if it's getting low. Additionally, you can use a preservative to help the tree stay hydrated and healthy. Additionally, you should keep your tree away from heat sources such as fireplaces, radiators, or space heaters, as they can dry out the tree. Finally, you should avoid over-decorating the tree with heavy ornaments or lights, as this can put additional strain on the tree and shorten its lifespan.