I think I'm selling mine when they go under 400$, which I hope will never happen, but might even happen today the way it's going down now.
On the other side I think I will sell them at around 900$
price now is pretty large, 550$, but i won't sell my bitcoins yet, not because that price will rise soon to 600$, but because of price rise after halving, i will sell my coins then only
because price then will be 800$ or larger, and if people won't stop buying bitcoins now,it will be even larger, as some people predicts that price will rise to 1300$ and more
i have also same thinking, and now halving is very near and bitcoin is going very well so we should have take attention on bitcoin's price. because in this month bitcoin has reached $700 and it is too fast.
So now still hold your bitcoins and wait it when bitcoin will cross $900.