What do I do if I can't hear out of my right AirPod?

Did you also check the settings for balance?

If your left or right AirPod isn't working - Apple Support

If still no luck, you'll have to replace the defective AirPod:

AirPods and AirPods Case Replacement - Official Apple Support

lani249 Said:

"What do I do if I can't hear out of my right AirPod?"

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Troubleshooting AirPods Balance:

Verify the AirPods Balance:

Two Methods:

A. On the iPhone, itself:

1. Go to: Settings
2. Tap: General
3. Tap: Accessibility
4. Scroll Down: to Hearing
5. Adjust: the audio volume balance

B. On an App:

Note that some apps have their own settings for volume. So, be certain balance on the app is as desired.