As stated in the subject above, maybe its time to open more channels, There are more and more people reaching high lvls and the higher lvl maps are having more and more people.
At level 140+ or 150+ there are 2 channels so its fine as it is, and besides, this is a stress test + CBT so its planned like his.
They added channels to lvl 150+ maps, besides you don’t need to stay long in lower level maps because you can just spam quests and do dungeons up to 140. Although quests with RNG that requires you to stay in a certain area with 100+ people is a bit frustrating.