Sorry for the late reply. Um I don't think there's a setting for that in the console since afaik the volume is fixed. You can try modifying the sound file itself though. Maybe through some third party program to make it louder. Or you could just download a different sound file.
I didn't make this myself. I already had the Scream of Wilhelm mod so I just swapped the audio files and renamed a few things. Try downloading some of the shout mods here on Nexus and see if you can modify them to your liking (be sure to get permission). Aside from that, I think there are tutorials out there that you can Google.
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Special Edition version is now available: https://www.nexusmods.com/skyrimspecialedition/mods/49508