GPT4 can be used to describe your tone by analyzing a few of your emails. Adding that to your prompt should help to get something closer to what you would writ

GPT4 can be used to describe your tone by analyzing a few of your emails. Adding that to your prompt should help to get something closer to what you would write, and you can iterate on this description if needed. Source: I built a chatgpt ui that make it easy to create custom prompt template because I was tired of the copy-paste and/or back and forth to get the tone right.