airpods do not fit in the ear. falling off.

If they don't fit no matter what kind of tips you use if this is about the AirPods Pro, you can do the eartip fit test

1. With your AirPods Pro in your ears and connected to your iPhone or iPad, go to Settings > Bluetooth.
2. Tap the More Info button next to your AirPods in the list of devices.
3. Tap Ear Tip Fit Test. If you can't see the Ear Tip Fit Test, make sure you have iOS or iPadOS 13.2 or later.
4. Tap Continue, then tap the Play button.

If this is about non pro AirPods, they're one size fits many so it could be that they're not for you I am afraid