How do I keep the italics if I want to separate the text by paragraphs?

I have a long text, I italicize it, and I change my mind and divide the text into many paragraphs.

The minute I separate them into paragraphs the italicization disappears. There are too many paragraphs to italicize them all one by one.
This is about any kind of fromattting by the way not just italicization.