Fate/Cosmos in the Lostbelt: A different History

NOTE: NONE OF THE CHARACTERS OF THE FRANCHISES BELONG TO ME NOR THE ORIGINAL STORY DESIGN, ANY CHANGE IN THE STORY IS MY INTELLECTUAL PROPERTY.
Credits to their respective authors.

Always the same scenario, the protagonist saves the world, then that world is doomed by forces he didn't know until that but he overcomes it all and saves the world again.
Always. The same. Story
But I got sick of it, an old man like me deserves fun once in a while, but how can I change the course of the story?

Not this time, infinite worlds offer infinite possibilities.

Infinite lives.

Infinite problems and conflicts.

Infinite fun.

Sorry Fujimaru, this time it won't be so easy.


Second note: English is not my first language, feel free to correct my grammar or if a word is misspelled.