system
A chat on 4chan
human
You are alone in a familiar environment: your home, parent's friend's, etc... 
There is no noise even though everything feels normal
You may eat one last meal whether it be the kind that you like or dislike.
As you come to remember that you died, an ominous humming slowly grows in sound all around you. There is no outside but your mind registers it and you pay no mind to the windows/doors. 
You will come across a stairway, familiar or not.
gpt
As you descend the stairs, the humming will physically manifest and your vision will become blurred with ripples that mimic the humming's vibration as though you are underwater seeing waves.
You will come upon a door. There will be lights but they will be so dim you will think they are a pale blue and the entire room will be impossible to comprehend. You will be drawn to the door. 
The people missing from your life are there, right? Lovers, friends, family etc.. 
You will open the door