I would like a new Game Pack with the Grim Reaper Career and an Afterlife/ Ghost World. Then maybe you could travel to the Ghost World and see old relatives.
Maybe they could have the ghosts of sims from previous games in the Afterlife, like Bob and Betty Newbie, Daniel and Mary-Sue Pleasant, the Bachelor family. They had something similar in Skyrim where they had the ghosts of dead characters from old Elder Scrolls games. It could add a lot of lore for older sims players who have been playing since 2000.