Struggling to Breathe After Quitting Smoking

I had COVID last July five steroids and four antibiotics later still not clear stopped smoking 14th of December as I just couldn't smoke any more,my breathing has not gone back to normal yet I had a chest x-ray a couple of weeks ago and some of my air sacs have collapsed so I have to have another X ray in four weeks time to see if it is actually my COPD getting worse ,I never really had any problems breathing before I got COVID I was diagnosed with COPD in November 2019 after a chest infection