Invest in a crypto market situation accordingly. There should be a framework for him to invest in which time to invest. And at what time to sell.
It always buys low and sell high but with the current market condition we do not konw how low the coin that we are interested to buy this is one of the risk that we are facing now my friend bought eth at $250 now knowing that it will continue to slide, I just told him to hodl as long as he can,
As long as he could do that, he doesn't have to afraid of the price; he can sell it anytime especially if the price can get pump higher. We keep trying to get the coins at the low price but then the coin price it's down and makes us desperate to see. But don't worry because after that, usually, the price will increase again and will pass your buying price before and you will make the profit.