How to make AirPods louder: Just a few simple steps - SoundGuys
How To Clean Airpods For Better Sound - Spectral Body
Why Are My Airpods So Quiet? - ElectronicsHub USA
10 Simple Ways to Fix Quiet Airpods - wikiHow
If your left or right AirPod isn't working – Apple Support (UK)
I just finished cleaning the airpods with the little brush near the airpods, one is sound good while the other now is a little bit low, before cleaning they sound equal :
AirPods sounding too low? 19 tips to make them louder
If one of your AirPods volume is lower than the other. This trick allows you to get the wax out of the AirPod and the sound is balance again 👍 : r/lifehacks
How to Fix Your AirPods When One Side Is Quieter: 10 Proven Solutions | Headphonesty