I don't give us any decide because firstly need to decide what your friends want to him then can. Basically now bitcoin price huge down if we have to hold bitcoin then we will getting more profit.so if she/he have good knowledge about crypto world then he/she can do that selling car and buy bitcoin.
The point is that he's not very good specialist in crypto. He thinks that it will simply work for him. But maybe in some time he'll turn on his head and start learning how to trade in order to rise his income.