When do you think will be a best time to buy bitcoin and when is the best time to keep bitcoin first before selling?
Well, the best time to buy bitcoin when the price at $200-400 I thought and you could earn some profits by sell your coins if that's what you looking for. But, anytime is the best time to buy if you want participate in developing bitcoin which you won't loss due to bitcoin value keep increasing from time to time. If you are daily traders, quite difficult to expected fast profits as now bitcoin price seems stable enough.
i am sure that you don't miss that moment in the last year because i see that price in november-december 2015 and after that, the price is really up until now. for the future, i think its really impossible to get down in that price unless there are many people will not believe with bitcoin and blockchain technology and then the price will reach in that number.