@Victoria2289
I looked at your profile, and didn't see any obvious red flags. Although Airbnb says you joined in October 2024, but then on your profile, says you've been on Airbnb for two years (?).
This is one thing that comes to mind; just joined (?). You have one good review though, so that's probably not it.
As @Joelle43 mentioned, is it near where you live? That's often a red flag, because it suggests you're looking for a place to host an event (party) or something. If that's the case, then be sure to be specific about why you're wanting to book that place - and it shouldn't be to party.
Otherwise, perhaps your introduction message was lacking any information about you or why you want to book it, or just a little impersonal? That can be a red flag too, especially for "newbies". And if you requested a discount, then the red flags start to add up.
And finally, it may have nothing to do with you at all. Maybe the host just wasn't interested. That happens.
I wouldn't take it personally, unless you actually had something to hide, and the host detected it somehow. If the latter, then I need not explain further.
I hope you found something else suitable anyway.