The “air” dial on KSHMR is like treble-boost, dialling that back from my suggestion will reduce the high-end.
If this was the quality of the original audio, OBS has done a good job to remove the mains-hum buzz & air-con noise
The residual buzz may be impossible to remove in post-production without damaging the voice.
Hum remover is the tool to reduce hum/buzz, but it does generate more ringing-artefacts the higher the values used …
