A being known as Dea is the creator of all things in the mortal world. He created human beings as living batteries in order to fuel him and give him power. This god is in competition with other gods for domination over the universe. Dea feeds off of human worship, which he uses to get stronger, gaining power any time humans pay homage to him.
As time goes on, the world becomes more populated. The amount of worship from humans increase and makes this God stronger. Eventually, Dea conducts a rapture-like event which ends the world. During this rapture, he consumes the souls of human beings, both living and dead. All humans ascend to this being and become a part of it, existing everywhere and nowhere at once. This gives Dea a massive power boost. The world resets itself and Dea re-seeds the earth with life. This process occurs every few thousand years.
In our world, the rapture is supposed to happen at any moment, without notice. However, simply rapturing individuals without warning is rude and inconsiderate.
( i haven't even seen the last season of GOT yet! Does the Night King kill everyone? Who wins the iron throne? It's not fair!!!).
Or something to that effect. People must be given time to prepare themselves, put their affairs in order, raise the last generation, etc. This is to show respect for the population. However, warning people of the last days can also have negative consequences. This needs to be done delicately, giving people time to prepare without disrupting society too much. (Not going to work, paying bills, etc)
How can Dea ease people into the last days without negative consequences?