If we hear the Xiaomi smartphone's alarm rather poorly or not at all, it can't hurt to increase the alarm volume, which is applied to all alarms and remains so even after the snooze function is activated or triggered.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Swipe  left  or  right  to set the  alarm volume
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Swipe left or right to set the alarm volume

Xiaomi Instructions
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