Simply because the WHALES take the profits whenever there's a 5 to 10 percent growth. The bottom line is Swing trading and Day trading is real and the HODL method is just what it is...
In the near term bitcoin can not reach the value 20k, but for the future bitcoin will get past the value of 20k. I do not think bitcoin will end, and therefore I believe that bitcoin will be able to reach a value of 20k.