Best copywriting tips?

Hello Reddit! I am a solopreneur who's trying to stay on top of AI... One of my BIGGEST issues is AI always fails to write like ME, it always sounds like a robot, no matter how many prompts I've tried. And having it index and copy tens of thousands of emails and having a database of templates to pull from. Claude is known for being the best, but it feels so far. Does anyone have any tips? I have a voice.md that has basics like "no em dashes", "ends emails with Cheers", etc", but it's not great yet. We write