As BTC is dropping now I feel this is a good opportunity to buy and sell for short-term there are lot of news coming across as miners are selling and this could be the reason for drop in the other hand institutions are investing money in BTC.
Everyday is a good time and good opportunity to buy and sell bitcoin if you really understand and know the bitcoin market. A good investor or trader do not really need the market value of Bitcoin to increase by a big margin in order to take advantage of the market for profit. The smaller changes are what that matters if you have good plan and strategy as an investor or trader.