“When I asked friends if they’re noticing coughs more or suffering themselves, they regaled and horrified me with their coughing fits. One had COVID-triggered asthma and an eight-month cough (under control now, thanks to two inhalers and a trip to the pulmonologist). Another was  a lifelong mucous-heavy cougher whose tips included “Chest Physical Therapy” which uses gravity and chest/back percussion to get phlegm to loosen and drain (she lies prone hanging over her bed while “banging her back”).”

https://www.thecut.com/2024/01/how-to-treat-a-cough-that-lingers.html