Manual pressure equalization is the fastest way to open blocked Eustachian tubes. These behavioral techniques alter the air pressure at the back of your throat, physically forcing the collapsed tubes to click or "pop" open. Blocked ears from cold: what to do - Boots Hearingcare
Applying a warm compress to your ear can help to loosen up mucus and reduce congestion.
Inhaling steam can help to loosen up mucus and reduce congestion in the nasal passages and Eustachian tube.