Volume Gauge
Display a gauge to indicate whether a livestream is louder or quieter than most other livestreams.
(Yes, OBS has a volume gauge however everyone uses different livestreaming software, there is no recommended volume setting/guide from Twitch, and livestream volumes widely vary even within the same game category.)

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Piglet7008 commented
When switching between streamers I often have to adjust the volume as:
1) some enjoy very soft levels while some are afraid that we won't even be heard at full volume.
2) Not to mention that not everyone (streamers) hear at the same levels. Meaning, acceptable just is not the same level.
3) Or some have intended voice speaking levels, but as a stream progresses, their voice becomes unintentional softer or louder.
With a tool, streamers could have immediate feedback to either prepare their audio levels or keep an eye that it stays within certain levels, where switching from stream to stream is just a single button click.
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Piglet7008 commented
When switching between streamers I often have to adjust the volume as:
1) some enjoy very soft levels while some are afraid that we won't even be heard at full volume.
2) Not to mention that not everyone (streamers) hear at the same levels. Meaning, acceptable just is not the same level.
3) Or some have intended voice speaking levels, but as a stream progresses, their voice becomes unintentional softer or louder.
With a tool, streamers could have immediate feedback to either prepare their audio levels or keep an eye that it stays within certain levels, where switching from stream to stream is just a single button click.