Before you are thinking about selling, think twice. Bitcoin can pump insanely high since the marketcap is really small and it can potentially go to 100.000+ per coin long term, so 600 to 1000 is absolutely nothing.
So what if bitcoin's marketcap is still smaller than PayPal or most banks? That doesn't mean it should be higher, maybe we are at our limit?
I mean bitcoin ATH price lasted like a day or so, it was a bubble. $100.000 per 1 BTC is like totally impossible price to achieve, it won't happen, definitely not during our lifetime.