@Erinç1
I can't see any listings attached to your profile so it's hard to tell what's going on, but a listing being old and small doesn't necessarily mean you can't get great ratings for it. There are a lot of things you can do in terms of making it attractive or setting guest expectations/rates that make it good value.
Anyway, if that is not an option for you, then I guess you can have that one under a separate account (you say 'we' so I assume you are not running your Airbnb business alone) and you don't lose much by starting again with it if the reviews so far are not that great. I have no idea about the tax ID though.