Why are you having sleepless night because you invested in bitcoin, since you were not ready to buy bitcoin then you shouldn't have bought it so that you don't put yourself into this tension that you are in. Bitcoin price is doing well and if you sell off and keep the money in the back, then maybe that is when you will have rest of mind so I will advice you to do what will give you rest of mind rather than worries. You should also remember that fiat depreciates with time. I have my bitcoin investment and I am pleased with leaving it for a very long period of time.
If you have advised him to do what he feels most comfortable with then you don't need to say this. Furthermore, that amount is only worth $152, so the loss of fiat value won't affect him much. You shouldn't make him more stressed.
In my opinion, he should learn more about bitcoin to understand it better and then he will make his own decision, whether to continue holding bitcoin or exchange it for fiat currency. Bitcoin is really good when its holders understand it, but if they don't understand anything about it, it's best for them not to invest in bitcoin because investing in bitcoin, in addition to bringing profits, also has risks involved.
Not really that bad to make some sell because if his mind and emotion do really tells him on doing so then it would be better on following that one because if you are really that following on someones advise and it do ends up for it to be bad or negative then for sure you would really be having that regret or would really be blaming out someone on the advise that they do give because it didnt turn out to be good.
This is why if you do make out investment then it would really be that better that you should be following on the decision that you are making and not on others but its not bad to see some comments
for at least you do able to read up some insights.
If you've been able to make profits then its not bad to secure those profits and its better to secure it out than to lose those profits if ever the market would really be going down.
Basing up on the movement then it is been that long time that we are really moving that sideways and now that the price is trying to climb up gradually
then it isnt bad to snip out those profits and cherish it out to bring out that ease of mind.