If you buy it during the time you posted this you are now earning a profit,buying bitcoins is depending in our limitation and the current price,if you are rich you can buy Bitcoin anytime but you need to hold ot for a long time because bitcoin takes time to bounce back after the dip,if you are a simple investors or if you are no big capital then you need to wait for the dip to buy BTC on cheap price,it really depends on our limitations and we need to use money that we can afford to lose.
If someone wants to invest in bitcoins or altcoins, then he has to go about the investment and then invest. About the investment so that investing is very risky, we always have to invest carefully otherwise we have to lose the invested money. We always have to look when the price of the coins is low and invest in those times. When the price increases then we have to sell and wait for the price to drop again.