I need to make sure the user's voice is reflected. If the user is usually formal, the post should reflect that. If they're more casual, a relaxed tone could work. The example provided in the query is very brief, so maybe expanding on that with a template that includes placeholders for personalization.

First, I should consider the context. The user mentions "m new," which probably stands for "my new" something. Maybe the sister's presence is causing issues with something new the user is doing, like a new project, social environment, or perhaps a new group of friends. Since the user hasn't provided specifics, the post needs to be general enough but still clear.

So putting it all together, the draft should start with a greeting, state the request clearly, explain the reason briefly if needed, express appreciation for her understanding, and close politely. Let me draft that now.

That said, I truly value our connection and hope this doesn’t change the good times we’ve had sharing other parts of our lives. I hope you can see where I’m coming from, and I remain grateful for your friendship.

Check for any possible misinterpretations. The user wants to avoid any ambiguity about their request. Maybe use a subject line if it's an email or a clear opening statement in the post. Also, make sure the tone isn't too harsh, but firm enough that the request is taken seriously.

Let’s keep things light and positive where we can—thank you for hearing me out.

I should structure the post in a positive and constructive way. Start with a friendly greeting, state the request politely, explain the reason if possible (without giving too much detail), and close with appreciation for understanding.

After a lot of thought, I feel it’s important to mention that I’m still getting settled into my new [situation/project/social circle/etc.], and I’ve realized that, for now, it might not be the best time for [your sister] to be included in this space. It’s not a reflection of her, but I’d prefer to keep this area of my life focused and low-key.