This really doesn't make it any better, I used to boost my microphone that way if I wanted to give someone tinnitus by the age of 20. My volume is already at 100 and microphone boost really fucks up my sound quality (and doesn't even work) so I'm using EqualizerAPO to bump up my microphone volume by some dB without any noticable static noise. Disable all effects in the same tab while you're at it.
And if you're struggling to hear others do snd_restart; voice_maxgain 8 instead.