Unless you are playing during peak times, you'd probably want to find a group and go to where they are forming as opposed to going to a zone and hoping to find a group.
Warsliks Woods is supposed to be good up to 30, after that you can try to form a group in Dalnir which starts at lvl 25ish. If you can manage to get a group to go there, the top half (not outpost of course) of The Overthere is great xp from 20-25. This is all on Kunark.
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