Work on more skills.
Incorporate the rest of the missing bosses.
Bring back scrolls from fishing/woodcutting (give people incentive to skill)/ (when you get time to add the skills)
Bring back the rares salesman whether he sits in duel arena etc. (would get rid of the huge amounts of gold in-game)
Take out infinite pots for free for gods sake. This is an eco server. What use is herb when you can just buy what u need.
I say these things because when battlescape was huge these were all major points of why I played the game. As someone stated above you want to cater to those and entice the ones who aren't playing. Not the 100 or so that are here now, but the thousands that are not.