Got some suggestions:
Website:
1. Make a snapshot of the map put it to website.
1.5 Info the map can contain: where depot and shops etc is, hunting grounds.
2. Make a Newbeginner Guide page on the website.
2.5 which can contain a nice starting guide for lowbies so they get find decent hunting grounds easy, and can do a few easy quests etc. To get them started.
In-game:
The game as it is now is totally lacking introduction. You just straight into it, and you know pretty much nothing. You are totally clueless and have to ask for help if you never have played the map before.
There should be good signs, or quest npcs giving you directions, you should start in a path where you gradually learn about the ot, whats special with it and so they learn where the different things are.
Many people will quickly get bored of the OT and quit.
Also since this is a 100x OT, you should make some nice chain-quests for higher levels, and you should always have monsters that are hard to defeat, even if you are level 500. And you should have bosses that are impossible to defeat even if you have 10x 500+ players. Just so people have a reason to continue leveling progressing, hiring friends and so on.