Your holiday to-do list wasn’t a manifest of demands penned by a hostile captor, it was an optimistic catalog of suggestions lovingly created for your present self by your past self.
Literally everything on it is optional.
And best yet, much of it is still doable.
The Elf can show up for 2 days instead of 25.
Your un-mailed Christmas cards can go out on Friday as “holiday cards”.
You can make cookies on Christmas Eve. Or Christmas Day. Or not at all.
You are not behind: not today, not tomorrow, not even 7 PM Thursday evening.