A Platinum upgrade will require a cancellation by someone else, because they only happen within 2 weeks of check-in. Since 2BRs are not deposited in either the general or Priority Access pools, a size upgrade is not going to happen. If you are hoping to move to a 1BR in something not named SSR or OKW, that's also very unlikely, because (a) they are deposited rarely-to-never (depending on resort) and (b) a knowledgable timeshare owner is even less likely to cancel one of them. It's not impossible, depending on the time of year, etc. and maybe not even Powerball unlikely, but you probably have better odds in your local pick-4 lottery.