Welcome to Mayo Connect, your journey sure sounds like Bronchiectasis with a possible MAC infection. If you go to the root MAC & Bronchiectasis support and click the search box, type in "airway clearance" and read about ways to keep your lungs clear.

As for whether you are too anxious- in my opinion it is time to consult one of the experts in treating us - Mayo, National Jewish Health, University of Texas, Tyler...
Diagnosing infections and deciding when and how to treat is their specialty. Both the infection and the condition are rare, and not everyone knows what to do.
Persistent atelectasis, tree in bud and ground glass opacities all can have many causes and diagnoses - an expert will sort through them and come to a diagnosis. Cancer is only one (slim) possibility-others are Bronchiectasis, COPD, bronchitis, bronchiolitis, remnants of pneumonia, bronchitis or Covid... Most of these, and MAC infection, can be treated, either to reverse, or to slow or halt progress, and especially to manage symptoms.
So please, do take the opportunity to consult the best, if it works for you!
Sue