Don’t know if my problem is the exact same as yours, but you could give this a try anyways. (A little context) Last night I realized that I’d been living with my right AirPod being louder than the left for about a month, and I had neglected to do anything about it. I decided at around midnight yesterday, that it was time for a change. I cleaned my AirPods, and got all of the ear wax and gunk out with a toothpick, very gently and carefully. I cleaned the main speaker, along with all of the other holes. I put them back in and noticed that while they both sounded better and more clear, the left was still much quieter. I then reset them, once again, no change whatsoever. (Solution) Finally, in a desperate attempt to restore my beloved AirPods, I put my mouth around the large speaker on the AirPod, and sucked on it until air came through. I did the same with the other one until I could feel air come through as well. To my joyous surprise, they had the exact same volume, both sounded much more clear and had better bass. No material came out when I sucked, but I went ahead and got a few tiny little bits of earwax out with the toothpick again. This may be disgusting, but it absolutely restored my AirPods!