I think we should keep it because our world is changing with technology. Certainly, the cryptos market will grow strongly in the future. Why not wait 3 more years? Why do not want high profits?
If you sell now, later on, you will regret why you did not keep it.
Advising to hold a long time, many don't consider the current needs of people for money. "Hold now and get profit in three years", - this council is good for those who has a passive which it would be desirable to increase. Regularly to earn money - it is necessary to trade, using volatility of the market.