I’ve been recycling a Dungeons and Dragons campaign that, in its first run, dramatically changed during the time it was transitioning from the “early introduction to the mechanics, world, and general themes” phase to the “initial major plot threads and character story incorporation” phase. Because of some players withdrawing due to pandemic-related stress and removing a player due to violating table rules and interpersonal conflicts, the scope of the campaign had to be drastically reduced since two of the early-plot-essential player characters were no longer in the campaign. And while I could find a way to make it work without them, the players left weren’t as interested in continuing those story arcs the way they’d been going. So I made some major changes, moved their campaign around in time, and changed how a lot of the story was being told. As a result, I had an entire campaign’s worth of world prep, plot notes/ideas, and cool magic items just sitting around.