What works for others may not work for you, but maybe look in on other model rooms to see what they do and how they change it up.
Conversation is a good place to start, some like to have someone to talk to and will drop a bit of credits now and then for a good person to chat with.
How much are you giving away in open chat, a flex for boosts, flash for tips, etc. ? Do you use the combination of open, party, group chats or private versus multi-user options?
My tastes are not the same as others, but continue checking around and find what will work for you. It takes time so don't expect an overnight change.
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