To make your Christmas tree smell stronger, you can try some of these tips: use a fir-scented candle or diffuser, spray the tree with a scent-enhancing spray, or wrap the tree in scented ribbon or garland. Additionally, you can hang scented ornaments or use a scented tree skirt. If you want to add a more natural fragrance, you can place real pinecones or other scented items around the base of the tree. Finally, make sure to water the tree regularly, as a dry tree won't hold its fragrance as well.