Does anyone know how to create a custom gpt that passes ai detectors every time?

I've been trying to create a custom gpt to generate content for my niche but there is no way to pass the quill bot detection that for me personally after testing it with real articles and other detectors, this is the most realistic of all. I have already given him all the prompts like being authoritative in the niche,only direct relevant content,with a casual tone,only use natural language,always use expressions,synonyms and vocabulary that I have provided in the knowledge,all his knowledge is manually written niche content,he has a list of synonyms,expressions that I use,and well it should be noted that I did not mention all the prompts,but take it from me I have it complete because I don't even have more space to put instructions.any advice? I know there are people who can do this because the guy I buy backlinks from, the content he generates goes through the quill bot and is generated by ai so he doesn't want to sell me the method. (I use gpt4 for create the content