Hi and Welcome to our group. It sounds like you have been doing some reading, which would always be my first recommendation.
You have obviously seen there is a wide range of symptoms, and treatments, in our diverse group. National Jewish Health, along with a few other multispecialty large practices like Mayo, have groups who specialize in managing bronchiectasis. NJH usually has a large annual conference, and many of the sessions are taped. I found it very helpful to watch some of them to learn more. You can find those from 2019 here: https://www.nationaljewish.org/education/pro-ed/live-events/ntm-patient-videos

Are you seeing a pulmonologist who is well-experienced in treating bronchiectasis and MAC? It is somewhat rare, and not everyone treats it regularly. Is there a plan regarding treating the MAC, or is it a watch & wait situation? Did you discuss nebulizing or airway clearance with your doctor?

Many of us have managed to control the amount of MAC in our lungs, and hopefully slow the progression of bronchiectasis, by doing regular airway clearance (using a vibratory device, huff coughing, manual percussion or a percussion vest) along with nebbing or inhalers. This reduces the amount of mucus, making it easier to breathe, and giving bacteria and fungus fewer places to hide and breed.

Some nebulize 7% saline, which has been shown to create an inhospitable atmosphere for mycobacteria. Even though I know I had MAC in my lungs in December 2019, the decision was made to discontinue antibiotics which I could no longer tolerate, and switch to 7% saline plus another neb. I have remained asymptomatic for 20 months, except one small flare. I will find out later this week how my lungs look...

I hope this has given you some food for thought. If it raises more questions, come on back and ask.
Sue