Play the game?
Not sure what rank or type of player you are but there's quests, crafting, the summer event, solo grinding/drop farming, group SP grinds, the rank 25 raid at Toto-Rak or just chill in a city and chat with people. MMOs aren't a linear experience. "What's next" is up to you.
Um, if he is at bentbranch something tells me he isn't ready for Toto-Rak... and also, most MMOs ARE a more linear experience. In most games you don't have 8 quests to do and then have to make up fun as you go. XI was like that to a certain extent but most games actually pull you along as long as you want to play - there is always something pulling you towards the next step/rank/whatever.
So it is a valid question.
OP, I would suggest you try doing your crafting leves - or buy a gathering tool and try gathering.
Failing that you might want to look at the abilities you can get from other classes - find one you would like - and level up until you get it. For example you get "Cure" from Conjurer at level 4. Since even discipline of war classes get MP, it is worthwhile to have cure to help you fight tougher enemies.
I suggest doing this because it should offer you some immediate gratification (it doesn't take long to get to like lvl 4) and it will make your main class stronger.
Take a look at class abilities in the Zam database and think about how you want your character to progress ^^; Edited, Aug 22nd 2011 10:06am by Olorinus