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I can only suggest what I use for congestion. If it is sinus congestion, I use a small vaporizer, sometimes a Neti Pot rinse, and most days an allergy pill. For mucus in your lungs, I use an acapella and spirometer machines 5 times a day, like you I take Mucinex, and occasionally I will take NAC. NAC is a mucolytic (meaning it breaks up mucus). It is available OTC or by prescription. Before taking any, check with your doctor first. Stay hydrated to keep mucus from getting too thick and sticky. The only other suggestion I have is to check with your doctor for ways to help with congestion. Take care and God Bless.