Many people have a whole routine to help clear their mucus in the morning. It can include any and all of these things: mucinex, nebulizing saline solution and/or albuterol, huff cough, percussion, either manual or with a vest and postural drainage. See your doc for other ideas.

I find that tapping my chest around both lungs for about 5 minutes helps to clear lung walls

I use the huff cough and it works great for me, so far 😃