At the moment, the queues for PVP expeditions can be upwards of 15 minutes for both factions, and if the people you found don’t just get bored and ditch, they’ll only stay for one win before leaving. 50 wins are required for the Expedition Leader title, which seems enormously steep, given the low popularity of the game mode.
A solution is to add a solo queue for the content. The developers must not have included one in the first place assuming that they would be much more hardcore than they are, requiring group coordination. Despite being 3v3, they are nothing like arenas in practice. The most optimal way to play is to avoid PVP altogether and to beat the other team in a DPS race. There are also so many ridiculous buffs around the map that it is very easy to kill the other team if you find the right shrines and whatnot, making any group coordination unnecessary.