Siri doesn't recognize my voice
Siri no longer recognizes my voice well. How can I set it up again?
iPhone 11, iOS 14
Go to Settings. Tap Siri & Search. Turn off Listen for "Hey Siri," then turn it back on. When the Set Up "Hey Siri" screen appears, tap Continue.
If "Hey Siri" isn't working on your iPhone or iPad - Apple Support