I don't believe in the ethics of financial advice, and I wouldn't like to manage anyone's decision.
I personally do think that we had enough proofs from the past to consider the assumption that history tends to repeat itself will win again.
The reason is simple - this is what holds my belief and understanding. That what I tend to stick to, and works for me on the long-term. But since my beliefs and other beliefs might be different, do not consider it as an advice.
The market tends to change, the technologies tend to change and the trends.
ONE THING WILL NEVER CHANGE -
It is the human nature - what bottom line is one of the major factors that move the market.
RE: Bitcoin Price Plunges: Is There a Real Reason to Panic In 2018?