My mom has COPD and here is what has been recommended to her:
1. Get plenty of exercise to keep the remaining lung tissue as healthy as possible.
2. Drink plenty of water.
3. Eat a healthy diet with lots of good protein.
4. Watch your weight
5. Use your medications/inhalers as directed
Make sure you find yourself a good pulmonologist and work closely with them to manage this disease.
Keep us posted.