Make similar sent messages in short time by the chat stand out for the streamer
It happens that lots of people in a crowded chat are telling the streamer all the same thing. And the streamer still doesn't notice.
One of the reasons might be because there are so many messages and emotes passing by every second.
Let's say 25 people write the same line. For example: "Watch your bag". It would be very helpful for the streamer (and comforting for the chat) if this line is set apart on top of the chat for a while. Bolded or with a bigger font for 15 or 20 seconds. This time can maybe even be adjustable by the streamer.