However, since Bitcoin had already broken the $5,000 wall, it would be now easier for it to do it again this time. We just don't know when can that be...will it be tomorrow, next week or just within the month of September?
I wouldn't call this a "massive sell-off" yet. We could see the price drop much more as part of a correction or dump. But the price will eventually go back to $5000 and beyond. A correction right now should be expected after the huge increases lately. I would look at this as a time to think about buying more Bitcoins or altcoins.