Cyrodiil (pve or PvP there), head back to your last zone, maybe challenge yourself by doing the public dungeon solo? You shouldn't be too high of a level to repeat some of the last zones content yet, while wandering you may even find some quests. Look through your achievements and make sure everything if filled out for the zones you have completed. Hmm.. Yeah. Wander! You could even try doing Cold Harbour now if you want more of a challenge.