How can I adjust Siri's volume on my iPhone 13?

“How can I adjust Siri's volume on my iPhone 13?: iPhone 13 Siri suddenly is almost whispering even with volume setting at maximum. Music and other functions seem unaffected.”

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Tell Siri in itself: “Increase the volume of Siri.”

“That works. Thanks. I wonder why, if you tell Siri that you can barely hear her or that the volume is too low, you get ‘I don't understand’ as a reply instead of that simple instruction.”

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You are welcome.

It’s probably second-guessed itself. Whether or not you have a strong accent (from New York to Australian), then it probably just needs to accept what it heard.