Gojo Satoru returns from the dead in chapter 260 of the Jujutsu Kaisen manga, but his status as the strongest spellcaster in history may not carry as much weight as before.
There are certainly a lot of questions about how Gojo returned and will he really return? This could directly affect his strength, making fans wonder how strong Gojo is now.
In modern times, there is no spellcaster on par with Gojo and he is the only one capable of taking on the King of Curses Sukuna. In terms of strength, Gojo had a slight advantage over Sukuna in their battle. Sukuna eventually won the match, but it must be emphasized that the Cursed King would not have been able to do this without Mahoraga.
But after death, Gojo's class may be completely different. On the one hand, he did not have time for his body to recover sufficiently and had no way to restore full strength. This is ideal for the story, as Sukuna has also been weakened by many consecutive battles with other spellcasters. So Gojo's second battle with Sukuna will be more interesting and dramatic.
Furthermore, returning from the dead may cause Gojo's effectiveness in using his cursed energy to decrease even further and he will not be able to perform the same techniques as before.
In any case, Gojo is no longer in the form he was when he started the fight against Sukuna and will probably no longer be considered the strongest modern spellcaster. The author will need to balance Gojo's power to suit the needs of the plot, so he doesn't overshadow Yuji and the others in the final battle.
With that said, for anyone expecting Gojo to return and easily defeat Sukuna, this is probably far from happening.