People unable to hear me. How can I increase the volume for them? I can hear them okay.

Hello,

Try cleaning them:

How to clean your AirPods and EarPods

If no help, try this:

Open the Settings app and go to the Bluetooth section. Next to the AirPods entry on the list of devices, you should see an “i” icon inside of a circle. Tap this, then select microphone, and set it to either left, right or automatic. Try switching it back and forth.

Note: you can test them using the Voice Memos app on your phone.

Good luck.