Sentence examples for it all changed from inspiring English sources

The phrase "it all changed" is correct and usable in written English.
It is a common phrase used to describe a sudden or significant shift or transformation. Example 1: "After her father's passing, Sarah's life turned upside down. It all changed in an instant." Example 2: "The success of his business venture came as a surprise to Mark. It all changed when he landed a major contract with a big company."