I guess we will see everything fall and bitcoin rise 
I dont think it will drop below 400 in the next 8 months.
It is not smart to sell everything at once because the value of the Bitcoin can always go up again, that means that you still can make more money. I dont think it will drop below 400 in the next 8 months.But if you have just sold them all then it is not possible, you should always save some instead.
Yeah if you save some of them then in future you still have an opportunity to make good profits when price goes higher so its always good to sell them in small parts instead of selling altogether.