There are two things you need to check to increase your microphone volume in Windows 11/10 computer. First is the actual volume level. You can use the volume icon on the Taskbar to get it done.

Microphone keeps resetting to 0 or 100 volume in Windows 11/10 If the Microphone keeps resetting to 0 or 100 volume, it can be due to a problematic driver, hardware failures, or incorrect settings.