Well, one way to make your Christmas tree taller is to get a taller tree! (laughs) But if you're just looking for a way to make your existing tree look taller, you could try adding some extra decorations or lights to the top of the tree. You could also try hanging a large ornament or other decorative item from the top of the tree. This will draw the eye upwards and make it look like the tree is taller. You could also try placing the tree near a wall or other vertical surface, which will create the illusion of height.