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- Click on this link to learn 'How to clean your AirPods, AirPods Pro, AirPods Max, and EarPods' --> https://support.apple.com/HT208729
In general make sure there is nothing blocking or stuck in the tip.
- Customize headphone audio levels on your iPhone or iPad --> https://support.apple.com/HT211218#manually-adjust
Check the audio level balance. Go to Settings > Accessibility > Audio & Visual > Balance
(On older systems: Settings > General > Accessibility)