The idea is, do not be stupid and sell now, hold on cause bitcoin will hit at least 50k in 2020/2021 and from now, it will be a 15 times profit. Patience is the key, if you haven't sold at 20k levels then do not be stupid and sell now cause the trader buying it from you now will profit big in 2 years or so.
Yup we must buy and hold for the future if you already bought/mined high better just hold and possibly buy more at this point