The only thing I can think of is to somehow help or make things easier for the people that are “left behind”. And pets, can’t forget them.
Freegards
I can just see myself telling my 17-year-old son, “I’m sure you’re going to be Left Behind, so here are the account numbers and passwords for my bank accounts. Be sure you feed all the animals, until you need to eat them during the Tribulation ... and I hope you get Saved eventually.”