Hey there Lauale,
Thanks for reaching out to the Apple Support Communities.
To get started, have you had a chance to work through all the steps listed in this link here: If your left or right AirPod isn't working - Apple Support
If there's no sound in one AirPod
1. Make sure that your charging case is fully charged.
2. Place both AirPods in your charging case and let them charge for 30 seconds.
3. Open the charging case near your iPhone or iPad.
4. Check the charge status on your iPhone or iPad to make sure that each AirPod is charging
.
5. Put both AirPods in your ears.
6. Play audio to test both AirPods.
7. If an AirPod still isn't working, reset your AirPods or contact Apple Support.
If still having issues after going through the steps above, we'd also recommend testing the issue with your AirPods connected to another device as well. This can help confirm if there's an issue with the AirPods, or maybe the device that they're paired with.
If the issue is present on multiple devices, then the next best option would be to reach out to Apple Support for available service/replacement options in your region. You can reach out to Apple Support directly from this link here: Get Support
If your AirPods are no longer covered under AppleCare, you can find more details on service and pricing here: AirPods Repair & Service - Apple Support
We hope that's able to help.
Take care.