i think best time to invest.... NOW. because tomorrow price will increase. this motto is able for all days. TTM.
It's just your speculation and in fact the bullish already turned to the bearish right now, and the price of bitcoin is decrease. Just try to put your order to the lowest rate. Don't get a wrong way to get the right time to invest.
Always buy the dip, never buy the peak, you can tell when the market is going to go higher or lower and it is relatively easy to determine when there's a dip, although sometimes you may think a drop is a "dip" when it is really a larger movement in the market, and you can get screwed out of some money that way.
A bearish trend would be nice right now. I wanna see if I can start running with the bulls again.