Can you give one example of new content which would make the really old game enjoyable again for you and for others?
For the game to be really enjoyable again we need fixes for some current features, lots of players, including me, have written about those A LOT over the years so I'll skip that part.
but here's a non-exhaustive list I threw together in a few mins of new content that fits within existing features that would improve the user experience, though admittedly a lot of them are existing or former script features which may not be available on mobile;
Classes
re-working class bonuses for 2021
Chat
coloured text customisation options
ranking fort battles from chat
crafting class indicator next to player level/name
Inventory
expanded window showing far more of your inventory on the screen at once
better categorisation for buffs, usable items
better clothing calculator
sell multiple items
improved item popups including information about sets and when the set was released
a section in the inventory dedicated to sets, allowing the player to more easily track and collect missing pieces
a popup telling you that you can use a repeating, timed item, such as event currency bags
Downgrade upgraded items at a cost of one of the three clothing pieces per level
Forts
Battle topic showing in the pre-battle fort window
better ranking interface/ranking from the chat
live battle statistics
a "walk to fort" button in the fort overview
Quest
A coloured indicator in the NPC dialogue when a questline rewards Skill points and is therefore worth completing
Sleep 0/1 removed from existence
timed quests with less than a 12 hour range removed from existence
at least find a way to make very basic repeatable quests not break on an annual basis
Tombolas
a better way to send event currency than the bloody friends bar
all items are NOT upgradable until they are sellable on the world market
Duels
minimap showing the locations of duellable players/bounties so you can more easily plan your route
lower duel level cap
Map/general interface
NPC finder
Hotkeys for actions such as sleeping, banking, walk to the next fort battle
re-sizable game windows
a logout button on the sidebar
travel popup prompt to equip speed gear
Market
tracking item prices so you never get ripped off
direct player to player trading
collect all items prompt upon arrival at town
an indicator of whether an item is on the town/alliance/world market
better market map
the ability to "box" a clothing set to buy and sell as one package instead of in 6-10 pieces
Crafting
in-game overview of all 4 crafting classes, because sometimes we need to look up materials for another craft
Rankings
Character class indicator in fort rankings
Alliance rankings
Towns
Fort ownership information in a town profile
Splitting the town log into two Construction and Residents logs
If I had to pick just one existing feature to be expanded and used to improve the game, it can be distilled to one word: Migrations.
All more worthwhile development pursuits than spaffing everything on another 50 levels while simultaneously making the PvP issues worse.
Could you please expand on "7000 skill points into a formula for 700 skill points" because I didn't understand that reference.
the formulae that the games' PvP features use were written in a time when you could have about 700 skill points, and now sets give a lot more than (7000 is a slight embellishment) that and it doesn't really work now as intended as a result.