you think this is the right time to buy and hold bitcoins? because from 19k its 11k today. 
The right time to buy bitcoin is when the price of it are high because there's a time that the price of it are unexpectedly rising. The right time to hold bitcoin is when the price of it goes down because if the price of it goes down there's a time that bitcoin will go high because when it goes down next of it is that the price of it will be rising.