Last major piece of advice, at lvl 54 while in AV you will get the option to go to Dalanis. Please don't do this, you will hate life. There are more then enough quests to get to lvl 55-56 try to get to 56, then go to Dalanis.
Actually, I'd strongly recommend going to Mysterious Torrog & accepting the quest line that takes you to Thunderhoof Hills just a few hundren k exp short of level 55.
As soon as you arrive there, you should then make a beeline for Kabo Kennedy and pick up his armor pack.
Next step, would be to head to Dalanis itself and have Arina Kaiyinth transport you back to Obsidian Stronghold. (Note the place you arrive cos that's how you get back to Dalanis later - talking to Hajikar Mashes.)
What you do next is entirely up to you:
- Return to Weeping Coast, Savage Lands and Aotulia Volcano and finish quests there; or
- Continue questing in Thunderhoof Hills, returning to WC, SL and AV as needed.
Whichever you choose, you
will end up short of XP a couple of times, despite what previous posts suggest.
You only need to add up quest XP rewards for each zone and factor in an amount for mob kills to realise that Thunderhoof Hills (55-57), Southern Janost Forest (57-5

, Northern Janost Forest (58-60), Limo Desert (60-62) and Land of Malevolence (62-65) will not quite get you to their intended levels. Sometimes you can follow the quest lines into the next zone, unlocking higher XP dailies (or do Butterflies in Xaviera) but you are likely to hit a stumblin block once or twice where you'll have to spend a few days doing dailies only til you level up.
Doing 10 dailies per day is strongly recommended, especially if they are the highest XP rewards available to you as they will likely hide the XP shortfall of these zones allowing to progress smoothly.
As for your current levels, the design of the game allows you to proceed from Howling Mountains/Elven Island/Yrvandis Hollows to Silverspring, Aslan Valley, Ystra Highlands and Dust Devil Canyon on one class.
Sascilia Steppes and Dragonfang Ridge is designed for your second class leaving Coast of Opportunity & Xaviera to quickly level your third class.
Following these paths allows you to reach approximate levels of 50/30/50 in the respective classes. You are then stuck with having enough quests to level only one of your classes to endgame. Dailies make it possible to raise the other classes and I haven't included Ravenfell, a 45-50 zone which you can use however you like.
Of course, you can turn quests in on whatever class you like as it is completely up to you how you play, but realise that when you run short of quests, you will have to spend some time doing dailies only.