Sadly one of my friends have that same feeling. He jumped into cryptocurrencies just to make money and he dropped like 1/3 in dollar value. Now he regretted getting into altcoin markets he seek for bitcoin investments.
If your friend is mentally strong, then he will always rise and continue reading the indicator, it is not clear when the time he mentioned but now bitcoin has experienced a good movement. It will ruin the price of altcoin on a temporary basis, but it will be green afterwards, I think your friend needs that kind of experience to make it better to analyze, if he gives up completely, he will throw all the potential in his experience.