>>102103312The only real trick is understanding what not to do, which is pander, beg, or otherwise seek attention from your oshi. That's just noise, and it easily blends in with the rest of chat, which is why it's so often ignored.
As for what to actually say, that's an individual challenge. Personally, I believe it's better to say less while being genuine, than to reply to absolutely everything when you don't have anything worthwhile to say just to get your name in the mix. Despite being the internet, social skills apply here also.