Nerd in another world

Like all good fanfic , a dude goes to reincarnation plane and meets so called god. There he gets his wishes and reincarnate in the world of one piece.
.
.
.
.
.
.
I'm an amateur writer, so there will be lots of mistakes. I will try to improvise as time pass, as I get more experience. Help me to grow as a writer by giving me feedbacks.
.
.
.
.
MC will have legendary world hopping ability. So story contains more than one world. One piece and marvel world are the part of the story and there may or may not be another world in story.
.
.
.
.
DISCLAIMER

English is not my first language so there is bound to have grammatical mistakes.

It is fan-fic. I don't own any copyrights of pre-existing characters

I don't own any copyright of a book cover. It is from 'solo leveling '.