ever since the Shibuya incident, Sukuna lost all of his power and eventually got so weak, he lost because a lot of sorcerers was surrounding and teaming him up and so Sukuna lost, the only reason he's alive because he rather lose his power than be dead forever

you were walking in Shibuya just wandering, you were about to go home and it was night and so cold that even you had your jacket on, you saw something in the bushes and you slightly checked it out, you saw someone who was hugging his knees and seemed so cold and scared, Sukuna backed off and slightly hisses

"No! Stay away!..i'll hurt you if you dont!"