The update (for maybe 1.19) i've come up with is very cool, and i think it's very necessary to make the end more fun/needed almost
New Mineral called Red Crystal, within the end islands, are extremely rare, only 1 or 2 every few chunks.
The new Crystal can be used to upgrade the scope, it now zooms twice as far, and tracks any mob/player within it's sight
The Red Crystal can also be used to make new blocks for beacons, as well as the new Red Crystal armour, weapons, tools, and tipped arrows
To make the armour/tools/weapons/tipped arrows you have to use the smithing table which would add yet another use for it
The red crystal armour will make you very resistant to fire damage(from the netherite armour) and very resistant to fall damage. You can also combine the elytra with the armour to have both of them on at once but it costs a lot of xp
The armour has three stages of upgrades to it 1st stage being one crystal on it with resistance to damage over all, 2nd stage on it will give you resistance to fall damage slightly with more resistance to damage, and the third stage will allow you to fall very far and take little to mid damage with max resistance (which if you take damage from a mob/player you wont move at all)
New biomes called end jungles, end valleys ( with amethyst crystal blocks), and end caves (which include the new ore)
Within the new end jungles there will be tannish bat like creatures called White bats (yes, from D&D) very aggressive, larger than the overworld bats, and do 4-8 attack damage every bite
The end jungles will include new trees and new grass like blocks (name them whatever youd like to(atleast make them purple))
In the caves there will be new dungeons, that spawn the white bats, that have good loot, withing normal cave generation with whatever new monster you can make besides the White bat
In the End valley’s there will be amethyst crystal spikes much like the ice spikes biome in the overworld dimension, no crystals will grow there but you can gather regular crystals
Improvements to the ender dragon battle, more health, and a new attack, wind blast which will blow you back up to 30 blocks, new animation for the attack
End city will have more buildings for more loot, but more shulkers, and phantoms now spawn in the end (since they don’t actually have a home *insert sad face here* )
All of the above do not spawn on the end spawn island you have to travel to the outer islands for these features
Thats all of the ideas i had for the end dimension update! Thanks for reading and hopefully we can see this in the game eventually.