Since you have placed your booking, maybe it would be great to  list down what makes you to proceed with the booking…is it because you like the location, layout etc? Everyone have their own preferences or priorities.

But maybe start to compare apartments around that area (new and subsales) and gauge with the price and packages offered by developer then determine whether is it reasonable?

Whether is it a wise move, you know yourself best. (Sorry to say that but do not like to give fake hope as it comes with a hefty price tag)

as long you’re well informed and made the decision with due diligent (with the worst possible outcome and whatever comes in the future, just take it as bonus), then just go ahead:)