Write a story in which the main character enters a portal.
Why are they entering the portal?
Do they want to enter the portal?
What happens when they enter the portal?
Write a story in which the main character enters a portal.
Why are they entering the portal?
Do they want to enter the portal?
What happens when they enter the portal?
Create a science fiction based world where portals are the main way of travel.
What are the limitations of portals?
What is the science/history of the portals?
How does extremely large number or small numbers of people travel through the portals?
Take the character from yesterday, If no character from yesterday use/create another one, then put them into a situation they would not normally be in.
Explain how they got there and what unfortunate events got them into that position. Then take them and drop them into a completely foreign place. It could be 100 years ago, another world/dimension, or even into a utopian society that they would have to adjust to.
Write about what happens.