The End of Times

It was year 2024 and everything was normal until towers and gates started showing up and monsters started coming out but Along with that came people who awakened super powers to fight the monsters Jack the only SSS ranked hunter was fighting floor 100 in the tower but died and along with his death came humanity's downfall but Jack reincarnated onto the past but this time he is in a babies body 19 years before the gates and tower appeared
Will he be able to save the human race or will he die again?

(I just took the image from Google if it's yours just tell me to stop using it and I will)