To make an artificial Christmas tree look fuller, you can use a few simple tricks. First, try adding more ornaments and decorations to the tree to create a fuller appearance. You can also try adding extra branches or garlands to the tree to add volume and density. You can also try adding a tree skirt to the base of the tree to hide the base and create a fuller look. Finally, you can try adding lights to the tree to create the illusion of more foliage. By using these tips, you can make your artificial Christmas tree look fuller and more festive.