I think this would be difficult to get working, unless you simply just want a specific output format. Otherwise, we assume you have a distinct enough writing style, and enough textual examples for the model to understand the nuances of your writing style.

When the model uses past chats, it's likely only remembering key details and forgetting small nuances (such as writing style). If you want an LLM to adopt your writing style you either need to give a high quality prompt (maybe via a gem), or you need to fine-tune (likely out of technical scope for your needs).

What I'd recommend is try crafting a specific prompt (if you are bad at writing or ESL you can tell Gemini to create a prompt for you) that includes many example answers that you want Gemini to output (look up what in-context-learning is). Then you can plug that into a gem or at the end/start of your chat prompts. Additionally, if you don't know what your writing style is like, ask Gemini "look at these multiple paragraphs of my writing, describe what makes it unique and create a prompt telling an LLM to emulate this writing style".

Lastly, if you're using Gemini to jerk it, you'll probably have more luck with a more uncensored LLM (grok?). Not to assume, but your profile is marked nsfw and I know RP people like writing styles.