The best way to keep your Christmas tree alive is to make sure it has the proper care and attention. It's important to keep it watered regularly, as dehydration can cause the tree to become dry and brittle. Make sure to keep it away from direct sunlight and heat sources, as too much exposure can cause the tree to lose its needles. Additionally, avoid overloading the tree with decorations and ornaments, as this can put too much strain on the branches.