To get a good audio level in OBS for your recaps, you can config OBS as follows (I´m using a cheap mic, noting fancy so if you have better hardware may be this config won´t be necessary):
1. In the mixer window of OBS, set MIC level to max:
Click gear below MIC and click on FILTERS:
Click + in the lower part of the window, add GAIN and set level to max (30)
These adjustements in OBS deliver a nice audio level in recording.
This video shows more filters you can add to your config in OBS