One of the best experiences is seeing different interpretations of the characters. Fanfiction might explore a character's backstory more deeply than the anime. For example, it could give more details about Yuji Itadori's life before he joined Jujutsu Tech.
To pick up the Jujutsu Kaisen manga after the anime, check out popular manga reading sites. They often have clear indications of where to continue based on the anime's conclusion. Also, you could look for forums or communities dedicated to the series for accurate suggestions.
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.