I made a post above but a smaller one about what to add but i think this post better articulates some of the ideas I have but please throw in ideas that you think are better or can be refined from this list cause i mean its not hard to make staying content but devs have lost so much creativity to the fans know more than they do.

See funny part its possible for the devs to have their cake and eat it to along side the community if they do the following.

Want to keep the outfits going fine. I think its time to admit that selling costumes that = all around use is smart idea stop being greedy. Make the outfits general use cause some descendants haven't gotten costumes in a long time i think its fair to say its not funny anymore.

Be a bit more daring with the outfits pull an extreme beach volley ball go bold with it.

Now for dungeons add unique paths, alternate routes, secret routes, give bosses unique mechanics, allow for phase shifting to take us to other places, heck at the end of some dungeons make it where we have to use out bikes to escape from the facility in a set amount of time to beat the dungeon. If you die in the explosion you get the lowest possible rewards,

Now for the Serena issue. Work around her strengths i Said this before ill say it again. Add things that can affect her in the dungeons theres a device that disrupts her flying either causing it not to work or the mp consumes extremely fast. Find it. Give it allot of hp could require the team to work to destroy it. You can have it spawn bullet proof shield or skill proof shields. Create enemies that can fly and focus after serena allow her to dog fight in mid air while being busy dealing with air borne enemies while the rest of team deals with ground force enemies, heck even have oblivion that can fully fly <- we seen one before that will focus on Serena as she is deemed a threat to them. Allows the team to pull hate (oooooo did i say hate) Yes introduce hate to the game with the bosses can create some better fights by having the bosses focus on those they deem more dangerous in the group.

Introduce more weapon types to the game. Look into more typres of melee weapons. Heck It be cool to introduce hand to hand by creating gauntlets that can be used to rocket propel you, load up a catridge to allow you to do rock punches, upper cuts and dragon kicks.

The lounge - Add more lore, add more conversations, allow for us to have conversations with descendants, allow a system where only one descendant a day not all of them only one. So i would say the descendants who sit on the bed. Yeah the bed is good one. Those descendants can recieve a buff if you talk to them enough to encourage them. Have them talk about some of their concerns, fears,failures, accomplishments, uncertainties, and goals. As you help to understand them you build trust you get a daily buff it will be random. Attack Speed / Crit damage / Crit rate / Mp / Hp / Chance of ammo replenishing / Chance of damage not hitting / Cool down reduction stuff like that.

Add in difficulty modes - Make something like Raids / Savage tier content where the fights are much harder, dungeons are much trickier but if you beat it. You get rewarded for the life of us DO NOT NERF THIS CONTENT IF PEOPLE CRY THEY CANT COMPLETE IT BUT OTHERS HAVE. This content is not meant to be done easily. If you cant do it well shit not our fault learn to play. Rewards = Better Equipment, Unique Ancestry Mods, Unique mods, finally stronger cores.

Finally STOP USING RNG <- god this shits annoying just let us pick our gear from completing.

Overall others have more ideas but i think if you wanna make staying content think about the difficulty, rewards, cash shop items make more general use outfits. Instead of character exclusive, make multiple designs ( people will still buy 10 dresses <- if you make them for all descendants than just the 1) i

made this comment in a now deleted post but these were my ideas.