Hello! I'm sorry you're having trouble with the Reaper event. I had some trouble in the beginning as well but I believe it was mod related. Even if you don't use mods, this step-by-step guide created by crinrict may help you to resolve the issue. It worked for me!
https://sims4.crinrict.com/eng/2024/09/reapers-rewards-event/
These steps will walk you through a user folder reset, so keep in mind that previously earned personal inventory items (like potions) will not be available. However, it will allow you to keep all your saves (mods, tray, etc.) and it should allow you to resume the progress that is missing in your current save.
