You have everything, you don’t need one. As a 9 with your fiery nature, it benefits to be in nature. Being fiery, water also smooth things out, listening to it, be by it. Having a lot of green around, can help. Buying plants, or having life in your home. Avoid external deities, YOU ARE the altar. Altar just means something that you hold high, usually people put what the person cherishes the most on the alter, usually alters were made from things you already received. Taking notice about the plants and trees around you, getting local.
As a path 9, system tends to be acidic, increase copper foods, cooling, like yogurt, more raw food, and Iron intake. Carrot Juice helps calming the system down, calming teas. Find things you resonate with and creating a resonant, personal alter.