Hello,
Thank you for your question and participation. First, congratulations on losing 45 pounds, that is a tremendous achievement! I would recommend two things. First, talk to your physician to see if there would be health benefits from additional weight loss. Second, is there a safe form or type of physical activity for you to engage in?

You could ask your physician about structured aerobic exercise, weight training and lifestyle activity.
If a formal program of exercise is not recommended due to your lung disease, perhaps focus on lifestyle activity would be beneficial. Dr. Levine, a Mayo Clinic endocrinologist has several published studies that show how important lifestyle activity (standing, gardening, brief walks, etc) is for achieving a healthy weight. A great resource is "Move a Little, Lose at Lot" by James Levine, M.D. It works with a concept called N.E.A.T which is also used at the Mayo Clinic Healthy Living Program.

The Mayo Clinic Healthy Living Program has a variety of comprehensive and focused experiences that can be customized to fit your goals, lifestyle, and health needs. The two that come to mind would be the Mayo Clinic Diet Experience or the Signature Experience. Here is a link: https://healthyliving.mayoclinic.org/offerings.php