Hi Rich
Sorry to hear about your situation. I have a condition that basically results in loss of lung capacity as I get older. I’ve ridden bikes all my life, everything from BMX, MX, MTB, Trials, Road. These days I don’t compete, I just enjoy riding my bike, with friends or out on my own. I don’t get too hung up on my situation. FWIW i would advise.. apart from taking good care of yourself and eating well, practice yoga. Find a good Iyengar yoga teacher to show you how to have good posture and maximise the lung capacity you will have. I practice every morning for about 20 mins and it’s changed my life. It’s also given me a better understanding of my body, helping me avoid injury. Don’t bother with all the yoga fads that are around just find yourself a good Iyengar teacher, they are by far the most scientific and aware in their approach. This may help LINK All the best.