Naruto: Become an Immortal Immortal after Unifying the Ninja World

[Invincible article, development flow, not following the original plot, making up for regrets, collision of ideas]
My name is Xia You, and I traveled to a space-time matrix composed of seven parallel Naruto worlds. The system prompts that as long as the unification of the seven Naruto worlds is completed, you can become an immortal and never die.
The mission is very difficult, but fortunately you can cheat.
So I decided to take Hashirama Senju to see how Tobirama died.
Take Madara to see how he was ripped out by Black Zetsu.
Take young Sarutobi to see how he was knocked down by Orochimaru.
Take Minato to see how Naruto was excluded.
Take Tobirama to see how Senju and Uchiha were exterminated.
Maybe I can also catch Boruto and see the heyday of Naruto in the Fourth War?