This feels like a common courtesy I don’t see enough, particularly the second point. In a conversation circle, always try to keep your side vision open to people trying to find their way in. It can be awkward to try and find your own way in so giving them a spot tells them they’re included then drop a quick brief on the conversation “We’re talking about pineapples on pizza, good or bad” gives them context to jump in immediately.
Use that power to bring others into conversations who aren’t as comfortable doing that! It is a really simple way to be kind for almost no effort.
I will. The best people in my life are the introverted nerds.