Greetings,
@Nuno Palma your in-game volume drowns out your voice quite a bit, I see you have a very good quality microphone that reduces background noise, however, this feature does make your actual voice a lot more quite. Option 1: You are usually able to change your microphone audio in your editing software, though this does slightly degrade the audio quality but it is barely noticeable and usually not a bother. (camtasia studio, sony vegas, adobe premiere just to name a few) Option 2: You could always use your editing software to turn down the in-game volume rather than your microphone volume. For Most games I like to have my microphone audio 50-100% louder than my in-game audio. (blue snowball)
Furthermore, you should be more enthusiastic in your commentary. Your video quality and resolution is perfectly fine, maybe not for people who are very picky about things like 2k-4k video and stuff, to the general viewer it is absolutely fine.
I hope this review has helped you in your content creating or you may have learnt something from it, if you have any questions unanswered still or did not understand something I wrote, feel free to tell me.
Edit: Audacity may also be plausible, I never did much with it but I heard you can change your volume and stuff there.
best regards, Aussie Chan.