The first chapter is kinda funny and interesting, but so far it looks like absolute generic trash.
It looks like the author just wanted a catchy title and a lazy excuse for the MC to be OP. Like really?
"I push button, I train, I go back to time where I push button, now I'm super strong and remember nothing from 1000 years I spent training."
Why not have the protagonist mature mentally or return mentally insane, Why not transport him 1000 years into the future? Why not do anything interesting?
Like what is the point the "1000 years" part if you just comeback the same, but stronger? The button may as well just skip the "1000 years" part and just make MC OP.
I swear the author just wanted to milk readers for the title and that's fucking disappointing to say the least.