The problem is in your body. I see no deep breath. No expansion of chest. No powering the sound with your body. Your chest is a resonator. You should feel the note there first. By the time it reaches the lips, it is set. You are too concentrated on the lips. Your playing is squeezing the lips but not driving with the breath and the body. Loosen up. The note should float on the breath. Just feel it bouncing on the air. Does that make any sense? If it makes any difference, most people get by doing what you do. And like you, their sound lacks resonance. Thoughts?