Bring old raids Up To current
Have Xür sell q very expensive buff that gives a kinetic primary a random elemental damage.
Bring up PoE to current with Forbes Changes (look it up)
Add a new vendor(s) who sells old guns (like shadow price) at an exuberant price but can be infused.
Add rerolling weapons but one only once a week.
Bring old strikes up to current and spice them up like Cebrus Vae or Dust Palace
Make Nightfalls harder but more rewarding. Instead of more, stronger adds maybe a mini boss in the middle. Like a Devil Archon replacing the Walker in Devil's Lair
Bring up any remaining Y1 exotics
Give more faction quests
Bring up currency maxes. (I always having to buy something when I hit 200 marks)
Give an option to fight other players in patrol like The Division.
Give set rewards (complete 300 strikes get this emblem sort of thing)
Revise old subclasses
Bungie do this and we will be content for a long while
[spoiler]Anything else?[/spoiler]
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What is the point if the weapons have no elemental damage? May aswell just use a weapon from the crucible if thats the case do boring. The weapons from year 2 are absolute dier so why not add elemental damage to those weapons then it will be fine to re add the year 1 weapons with them aswell?