First, what I feel the game has a lack of:
-Unexpected enemies/challenges/anything random to deal with.
-A situation where we can round up some people and go do a special thing- especially during quiet hours.
-Cutscenes where our character actually does something apart from draw a weapon or take a menacing step forward to an enemy.
-8 person Praetorium is gone, and it was special, cause it was a little bit of an outfit show sometimes amongst the 8 players- But something better can be done in it's place.
There's a way to tackle all of these with one new piece of content really, but by looking to the past to do it. I'll just say that I really like the 1.0 trailer where the catgirl/hyur/elezen are checking out those leve plates and all that. A new series of leves could be added. Make it so you purchase a box of broken/discarded/cursed leve plates or something, and there's a 2d graphic that comes up on the screen looking down at a box and all the broken ones get swiped out of the way and a random intact leve plate is uncovered. They could add like 14 of them, some rarer than others etc. Make it so '1 box' of broken/discarded' leves costs 1500 poetics, or you can also get 1, 2 or maybe 3 boxes in exchange for a Khloe Bronze Certificate, giving those extra use.
The leves themselves are basically a special duty (half the length of a regular dungeon) for 4, 6 or 8 players (depending on leve), where the enemies are random and unpredictable (but somewhat in tune with the area- you won't know what will appear next or how strong an enemy is until you attack it- even when using the same special new leve plate you've used before. The leve plate seen in the 1.0 trailer looks like the area around the Euphrosene alliance raid- it'd be cool if such a leve took place behind the starting area currently seen in the alliance raid itself. These leves would also have some co-op puzzles and such (like in that Qitana Ravel solo duty), maybe activating switches or assisting NPCs aswell. If everyone get's KO'd the duty ends and that's that, no restarts (but raise works as normal etc).
Part 2 in next post due to char limit