Visiting the introduceyourself tag once in a while can really help to discover new users that are eager to start their Hive journey on a good footing.
I've been playing around with the idea of picking one or two and doing what I can to help them with advice and upvotes in the start at least.
Maybe this idea of adopting a red fish come do wonders for user retention.
I'll look there when I get time, but I have others letting me know about some good new accounts. My @tenkminnows account is voting up lots of redfish.