If none of the tricks work on your AirPods, Apple offers these tips for how to thoroughly clean your headphones: Reconnect/repair your iPods to see if that helps improve the volume. Sometimes it is just as simple as removing the volume limit on your device.
Your headphones should be now clean and ready to use.
Put back the ear tips once everything is dry.
Tap on Audio/Visual and check the right and left Balance. After your headphones are completely dry, reassemble your earbuds.
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