@4wdlimo Let me welcome you to Mayo Connect, and try to give you some direction.
We have a support group who have a lung disease called Bronchiectasis, which makes it difficult for our lungs to clear mucus on their own, so we routinely do airway clearance to stay healthy.
Herer is a video about how to do it at home:

If that is not enough, she adds a device called Aerobika, which vibrates the bronchial tubes to help move the mucus. These are available on line.