I mainly stream drums or music production, so I either comment on the song once done playing or give comments on my thought process while producing. At this point it's almost natural, and in a way therapeutic...cathartic?

It's awesome when people hangout and ask about certain drum items or techniques, and it's a great time to comment on the music they request.

I think it would be awesome to always be giving your thoughts and ideas about your Sims/your buildings while you stream. People will come and hangout eventually, but until then I bet it'll help your creativity to just make yourself talk. Maybe even roleplay some of the character ideas/paths out? A big enjoyment factor of the Sims is the ability to create your own stories and world - really vocalize and share that with your audience, so that they become attached to your Sims with you.

I'd also recommend recording these and trying to make a YouTube series with it. The Sims has a great scene on YouTube, and it's even easier to build the narrative there and bring it live on Twitch.

My best advice is to turn the viewer count off and continue talking like you have a big audience!