1. Enable Game Mode. Game Mode can be enabled via the Windows 10 "Settings" app, under Gaming > Game Mode.
2. Run OBS as Admin. Right click on the OBS shortcut, properties, advanced, check box, ok, apply, ok.
3. Your mic has a sample rate that doesn't match the OBS sample rate. This can result in audio drift over time or sound distortion. Check your audio devices in Windows settings (both Playback and Recording) and ensure the Default Format (under Advanced) is consistent. 48000 Hz is recommended.
OBS Sample Rate: 44100 Hz
Microphone (FIFINE Microphone ): 48000 Hz
4. Remove the win-capture-audio plugin and use Application Audio Capture (BETA) source.