Earlier quoted context omitted.
To determine this you'd have to track how many companies raise funds and how much they raise (at what valuation) both inside and outside of YC. From my own view on this supported by quite a bit of data I would say that YC is as close as you're going to find to a stamp of approval in the start-up scene, it has a substantial effect on your chances to raise funds and on the amount you will raise when you do.
Actually, Airbyte is a pivot from a first product. And we struggled a lot to raise with the previous product, even though we were fresh out of YC. YC is an indicator but not enough by itself.
Time will tell if you will succeed, best of luck to you and your team.
But keep in mind that raising money is not success in itself.