You could try taking a body of your own writing and asking it to characterize it/come up with a prompt (or fine tune if you can) describing your style and quirks.

This is usually what I've had luck with. I've given it samples of my writing and told it to emulate my style. It did help, but it took some charistics of my speech and cranked them up to 10. I guess in hindsight I could have mentioned for it to take my writing quirks it finds and only apply them in moderation.

Reading what I did get out of it was just a bit uncanny valley strangely enough. Very much had some "hey there fellow kids" energy.