For me, I think it's important to think about what's necessary to include or not. Read your notes and imagine it playing out like a movie in your head. What drags on and what isn't progressing the story?
A lot of creators focus too much on "telling," instead of showing as well. Question yourself on how much exposition you can turn into moments, rather than long diatribes. You don't need to explain everything, let the reader infer, and let the reader use their imagination. In real life we often don't have the full context about situations but we can make assumptions. There is a time and a place for both showing and telling.
There's two directors who also said some impactful stuff that I took to use for when I create. One is Quentin Tarantino, and the other is Taika Waititi. I'll link both . I hope they help.
As for Waititi you don't have to do exactly what he does obviously, but writing another draft from memory will definitely cut it down to the essentials. I do it for some issues I create on my series. I'll start a rough draft with the story beats(in bullet points) I think are important, and then I'll scrap the page and do it from memory.
As for Tarantino, I treat my characters like they're living beings. I have certain beats I want to hit, but let them tell you the story. It'll cut down on the unnecessary things if you just go with the flow.
It sounds easier said than done but in the end, let the story unfold naturally. I'm not a fan of how long One Piece is, but the fans of it are. Your story will find it's footing, just start creating. Focus on creating a story you'd like to read, and it will come out of you naturally. There's no right or wrong! If you'd like to shorten it though, I hope my advice and the videos help