So how is placements gonna work this season?

I changed my playstyle the past few days and began rising out of bronze. I was b5 and rose to b3, but now everything is reset, which is okay.

But even if I keep getting S and winning as I have been, will I be put in b5 again no matter what? Because we are supposed to be placed lower than what we where..?

I'm not entirely sure, because you cant get much worse than bronze, so am I doomed to get placed in Bronze no matter what, or will it possible to get into a higher elo by doing exceptionally well?