1. Use lights to add a sense of fullness to your tree. The twinkling lights can make your tree appear fuller, even if it's sparse. 2. Add a layer of garlands or ribbon. These will add volume and texture to your tree, making it appear fuller. 3. Place decorative items strategically around the tree to fill in any empty spaces. 4. Try to avoid overloading the tree with too many ornaments. Too many ornaments can make the tree appear too busy and detract from its overall appearance.