One way to make a Christmas tree look taller is by using a tall, narrow stand. This will allow the tree to stand up straight and tall without being too wide at the base. You can also use a ladder to raise the tree up a bit, so that the top of the tree is closer to the ceiling. Additionally, you can add more decorations to the top of the tree to make it look taller, such as hanging ornaments or placing a star on top. Finally, you can also use light strands to make the tree look taller, as they can add height to the tree without adding any weight.