If your iOS 17.2+ Clock alerts (and other alerts) volume is so low that alerts are almost inaudible,
and if your Settings -> Sounds & Haptics -> Ringtone and Alerts volume is already at maximum,
you can fix this by changing Settings -> Face ID & Passcode - Attention Aware Features to OFF and then restarting/power cycling your phone.
It's clearly a bug.
I have to admit I didn't even know this setting existed.
Solution from Apple Discussions: Alarm volume is too low.
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