It probably depends on your play times and where you're trying to level up at. Zones like Crushbone, Unrest and Oasis almost always have people leveling in them and if you play during prime time, it'll actually be difficult to find a group and camp that has room.
You can also try joining a leveling guild, which usually makes it easier to find others to group with. I don't know what guild would be best for that these days, but Kittens Who Say Meow used to be a good one. I think there's a Blue Republic guild that seems to be on the rise as well.
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