Hello Zemblance,
Welcome to Microsoft Community.
According to your description, your DELL G15 laptop can recognize your microphone normally, so by clicking Start menu- Settings - System - Sound, you can "type" to see the name of the microphone, right?
At this point please click on your microphone, then click on the right of "Test microphone" to start the test, after speaking at normal volume for a few seconds, stop the test, please let me know the test results.
When I test with 100% microphone volume on, I usually speak at 15%-20% of the maximum volume at normal volume because I don't make any particular effort to speak.
The enhanced audio feature in this option does reduce the audio quality, but please click "More sound Settings" at the bottom of the sound, then click "Record", locate your microphone device, click Properties - Advanced, check "Enable Audio enhancement" in the signal enhancement column, then click "OK" to save (Audio enhancement here is different from that in microphone properties, You can test if it can help you).
If you find that the percentage displayed is the same as what I described, this is normal. Please click on "Input Devices" to the right of Troubleshooting Common Sounds to troubleshoot your microphone and let me know the results.
Also, if possible, test other microphones in your device to check whether they have the same problem.
Best regards,
Mitchell - | Microsoft community support expert from MSFT