At the moment, its obvious to see a big decline in players and this was to be expected once they realized that EP6 really doesn't change the game as radically as they was told to believe, people got essentially nearly free liberate gear without nearly as much effort same with some units too, the problem is though for alot of the playerbase we are being literally starved in one vital element of the game and that is the Ultimate Boosters.
Currently, it there is relativity speaking limited reasons to do UQs. The drop rate on the desirable drops is obnoxiously low, chances for ultimate boosters is atrocious as well, we need the booster shop asap to at least continue the gear threadmill moving forward as it makes it just more tolerable for upgrading gear, without it - its literally making people quit or go on haitus because they are being literally forced into repeating the same content thats literally all you can do, day in and day out and ask yourself, how many are going to get bored and move on? I think the big dip in playerbase has already answered that question.
Many veterans that are already at the point of min/maxing stats are literally going on haitus because we have little reason to play now, I'm personally just logging in to do dailies and thats about it because I know, UQs are not going to drop what I want or need and are serving as a complete waste of my time. Case and Point, the last two EQs I did was UH PD and Luther earlier, both didn't drop a single rare let alone any useful resources, so I'm personally at the point where I have to force myself to log in.
Bring back some of the more interesting things like Piper of Disharmony for instance, give players actual incentives to log in and do content that is going to reward them, give players a sense of progression again because once players feel like they've stopped progressing at all, thats when people move on. Whispers recommended quest is fine, but once again..thats the only one that is even remotely worth doing as the others are just useless fluff with no real reason to do them.
Global server is still missing a significant amount of content that the JP server has, that alone is a big problem as some of that is really important and Sega has not addressed that for global at all yet, rolling out piecemeal content now after rushing though the episodes is going to backfire as people got geared far faster than normal and now, hitting a hard brickwall due to lack of options unless you do hard grind without any guarantees of even essential resource drops, as people start going on haitus it becomes harder and harder to do the content you need to do , and this is what starts the next wave of alliances dying from lack of activity as people jump to more active alliances that do triggers, its all a downward spiral unless you do something to about it.