Be patient, you will lose too much by selling it now, crypto will not die and you better keep holding to wait for market recovery. And don't worry, the market will definitely show a change to a better price.
I thought some people in some thread said experience is the best teacher. You really do not have to tell him because he won't understand. Let experience teach him some lessons and later on if he is smart enough, he would know that downtrend are there for some reasons and the main reason is to shake out the weak hands, and as long as you are smart enough not to be a weak hand, you will always get the best of the market in the long run.
It is just unfortunate though, that just very few people know that, and one of the reasons a lot will never take advantage of the dips when it comes but end up focusing on the end of crypto that is just starting. People tend to think like this because they never had a single idea of what they are investing into in the first place.
What a lot of them were after is to make quick bucks, with no knowledge of what the future holds or why they should really be investing, let alone, knowing that this is a market that is new, here to stay and just starting with good growth and for someone to consider a bear market as the end, shows just how ignorant they are and how they really should not even be considered as real investors in the first place.