I also have a very specific voice. Blunt. Slightly irritated. Highly opinionated. AI is pretty bad at trying to emulate that well.
Other than that: 1) I typo a lot 2) I think I have my own voice in writing, which is recognisable 3) Likewise in art or music, even perhaps code
If your genuine human-made writing uses tyle guides that sprinkle em-dashes unnecessarily and uses forms such as ”Honestly? Blah bla blah.” the problem is not AI. Read Hemingway or Wilde or anything please.