Show up in follower feeds as a guest on someone else's Stream Together session
Right now, if you are not broadcasting and join someone else's Stream Together, you will not show up in your followers' feeds as "live": you show up fine as a +1 for the host of the stream, as well as the other live participants, but your own followers have no idea of your involvement in these streams on their follower feed unless you start your own broadcast (which is bad in certain scenarios, that I will expand upon in a bit).
Hence why I suggest that if you are not "live", but still participating in a Stream Together session, you should show up in people's follower feeds as a guest on someone else's stream.
Forcing people to go live for maximum visibility can actually hinder these efforts for certain types of projects, like group podcasts, tabletop sessions, game shows or other events centering around a certain stream: by encouraging people to have multiple streams on for a specific activity, you end up splitting the chats and audiences and ultimately cannibalize the group activity as a whole.
The current Stream Together setup only works well if both/all streamers have their own PoV to contribute, like specific gaming sessions, but that one should already be covered by Squad Streaming: right now it feels like Stream Together is a bit haphazard in its implementation, since the podcasty nature of it gets muddled down by splitting the audiences.