Hello, Song! I think you should start with short stories, maybe you can try with "The Canterville Ghost" by Oscar Wilde. I have not read it yet (I just grasp the beginning), but since I was searching for a piece of English literature easy to read and short, I've got it as a recommendation. Here you can find it (along with many other ebooks): https://ebooks.adelaide.edu.au/w/wilde/oscar/canterville-ghost/complete.html
Hope it helps,
Bill is right. Harry Potter is fantastic in english. But you must know the language already, I think it's intermediate english.
Try "the Pearl" from John Steinbeck.
Had to read it as a teen and it's a great story.
Find a book that you know and maybe even love, then find out if there is an English translation.
One of the key things we know is that you learn best when you are interested in the content and have a clue as to what is going on.
I am presently reading the Harry Potter books in Italian, I know the books in English and it has certainly helped me by accelerating my Italian reading.