Most audio settings have a mic boost and an adjustable mic gain. For Windows 10, this is found by going to Sound -> Recording Devices and selecting the properties of your microphone.
Step 1: Ensure that Automatic Gain Control (AGC) or similar automated sound levels are turned off.
Step 2: Ensure Boost is set to zero, and then adjust the gain until it sounds correct. You can listen to your own mic in the “Listen” tab in the properties of your mic.