at 67lv? r u even serious? go to toi,only place for u, after 76++ try cod ,or doe ,dv after 80 mahums,it and ofc make all dailies quests.
until 72 you can try pavel ruins, provoke and spamming skills you get a lot of hp back (with iss buffs, if you have sonatas bigger trains :d). after 72 you can try doing small trains at fog with knight harmony until you reach 76 and do what st0ne said ^^.