The concept of sacrifice is also a major theme. Some characters have to make sacrifices in order to protect others or achieve their goals. For example, they might sacrifice their own safety or their personal desires. And power and its control is important too. Characters are constantly striving to gain more power to defeat stronger curses, but also need to learn how to control that power so it doesn't consume them.
Yuji Itadori could still be the main character. He might have developed new and more powerful techniques in this fanfiction, and be the one leading the charge against new threats in the future of the Jujutsu world.
The Jujutsu Kaisen manga is indeed ending. It's been a great run, but all good things must come to an end. The final chapters are bringing closure to the characters and story arcs.
The Jujutsu Kaisen manga has reached its conclusion. The story came to a close with a satisfying ending that wrapped up the plotlines and character developments.