Sentence examples for all of my from inspiring English sources

"all of my" is a correct phrase that can be used in written English.
It is typically used to indicate possession or ownership of something by the speaker. It can also be used to emphasize the entirety of something that belongs to the speaker. Example: "All of my belongings were stolen in the burglary." In this sentence, the speaker is emphasizing that everything they owned was taken. "Can you please return all of my books to the library?" Here, the speaker is indicating that they own multiple books and they want them all returned.