Fixing the multitude of problems this game has with lag, steam issues, pithy glitches and bugs. I don't give a crap about santy hats or even t4 if my connection to this game is unreliable. This is honestly one of the worst games in this regard, which is devastating its pretty rich design. I know this is F2P but seriously, alot of people have put alotta money into this game and by not addressing the most pressing issues you're not delivering an adequate gaming service.
What's horrible is that skill can't be that big of a factor when [crap] will damage you when your shield is up or the timing get messed up in a dungeon and you never know when you'll get damaged really. It's not player fault half the time just [crappy] glitches or mistakes. This detracts the most from this game and really needs to be ameliorated for a truly pleasant gaming experience.
Should move this to suggestions. But I'm gonna go out on a limb and say you don't have a firm grasp on the technical limits between Java, the AWS cloud, and the low system requirements makes for the game. They've been trying to find way to improve it, but there is a lot more involved then a typical native Windows game.