Just registered to the site after experiencing the same problem everyone else has. I followed Neuromancer49's suggestion in the reddit thread and it worked beautifully!
Download EqualizerAPO
Set your device
Reboot
Navigate to C:\Program Files\EqualizerAPO\config\config.txt
Add the following lines in that file as separate lines:
Device: Microphone
Preamp: +XXdb
XX above can be any amount you want to increase the volume by. His guide says +16db, I ended up going all the way up to +35db. Be advised that the windows microphone test will not pick up the additional volume, but Discord and other apps should.