Thanks for getting back with us DPAR15, it’s appreciated.
About firmware updates for AirPods - Apple Support -- Let’s make sure your AirPods firmware is up to date. You’ll want to be sure the device you use your AirPods with most frequently is also up to date. Since we haven’t asked for the specific model of AirPods you have, to see which firmware your AirPods are on, on your iPhone or iPad go to Settings > Bluetooth > Info Button beside the name of your AirPods. Scroll and down to “About”. Then compare it with the chart in the article that lists the latest firmware. There’s also steps to locate the firmware version on a Mac in this article as well if needed. If they need updating, connect your AirPods to charge and keep them within Bluetooth range of the device for a bit. Once the firmware is updated, please test the issue.
How to reset your AirPods and AirPods Pro - Apple Support -- If Notification sounds are still too loud, reset your AirPods:
1. Put your AirPods in their charging case, and close the lid.
2. Wait 30 seconds.
3. Open the lid of your charging case, and put your AirPods in your ears.
4. Go to Settings > Bluetooth. Or go to Settings > [your AirPods].
• If your AirPods appear there as connected, tap the More Info button
next to your AirPods, tap Forget This Device, then tap again to confirm.
• If your AirPods don't appear there, continue to the next step.
5. Put your AirPods in their charging case, and keep the lid open.
6. Press and hold the setup button on the back of the case for about 15 seconds, until the status light on the front of the case flashes amber, then white.*

7. Reconnect your AirPods: With your AirPods in their charging case and the lid open, place your AirPods close to your iPhone or iPad. Follow the steps on your device's screen.
If the issue persists, we recommend reaching out to Apple Support to look into this further with you: Get Support
All the best.