+1 on Both

just write it whatever you like. the biggest issue is keeping the flow of the story. most fanfic writer i see end up burned out by seeking perfection of their fanfic.

Well an S class ninja fighting scene should be a bit boring. An exciting fight is for those ninja that are Genin or Chunin rank. A ninja should win a battle before they enter it.

Try not to follow the Canon too much as you are not writing about Deku here, but someone else. Perhaps trying to go to politics, changing some Politician character way of doing things, or starting a small business as a side story. Or promoting a law so people could finally use their Quirk for daily lives and jobs or something. MHA is quite weird where there are quirks that are productive, but wasn't being used in construction, metallurgy or anything. Acid producing quirk could make them a very valuable employee for chemical industry.

Well, 2,5. You could do much without relying on other people interest. You could kill a character, or a love interest just to reduce the clutter. But if you do, you must prepare the long term plan to bring the story to the end. Just write what you think would bring your story forward. This is your world, your story as of now. Bring it on to the end of the line.

Dude, this is why I do not reply to comment on my fic. Interaction with your reader could give you good, but mostly bad as our fic won't cater everyone interest, at best only parts of the society. People would always complain if we go on writing harem, or write ***, or kill our character. Who cares.... just write, we write for ourselves not for others. Their hate, their grief, their anger is our fuel to write. Many great Writer have their inner Troll spirit, that we still read their writings even when we think their character being a retard worse than we are. Be a Joker, people would hate us? So What? We are god in our Fic, and our Fiction is our world where we do what we want.

Ecchiness is justice. Those who refuse ecchi is heretic.......

For a story of self insert into one Piece world, it is quite good. Refreshing as it breaks the canon storyline. The story pace is fast, so I am worried when it reach past the current Canon, the story would deviate too far in the world background.

Nice chapter, and getting outside of Canon rails is the sign of great fanfic.

Just write what you think comfortable to continue the story. Your story is quite decent, not reaching top level yet in the story telling and characters as ATG itself is quite a cliche of Xianxia novel. You could make the younger character out of canon character if you like. Just not too fixated on the canon timeline and events.

If I am Hajime and get sent back in time, I would curb most problem before they happened. Preventing the classmate to get killed in the first place, gaining trusted allies like Endo early, even gaining REAL DEMON subordinate early on. Good idea by sacrificing Kouki to Eri early on. Would be funny story when after dealing with Ehito, Kouki was summoned again to another world.