There is pressure buildup in my right ear.

Since when, I started feeling a stuffy sensation in my right ear, so I wondered if it was due to using headphones, and I tried to reduce their use. I used to listen to lectures or music while working or walking, but I feel a bit disappointed. There is also a story that the air gets trapped because the muscles inside the ear relax and prevent the air from escaping. So, I am doing ear massages and pulling on the earlobes. I am also trying to block my mouth and nose to exhale. If you could tell me which muscles are involved, I plan to focus on caring for them.