The lore is full of ghosts. I just looked up ghost on the wiki and there are many many. How about next year a well known ghost like Gwen Thackeray or First Mate Shane sends us on a collection which involves other ghosts in dungeons, raids, strike missions, fractals, jumping puzzles, etc.? I am not saying add new ghost characters. Just repurpose speaking to ghosts already in game. (That list was for example. I don’t know that there is a ghost in one of the raids or other parts mentioned.). The reward could be a new spirit weapon, ghostly infusion or something else spooky theme.