The biggest mistake anyone can do is still holding unto their altcoins when bitcoin touched 60k weeks ago and still holding strong when the fall began weeks ago, imagine someone still holding HEX token when the coin did 40x already? If you are someone like this friend I don't know what your aim is but sorry to say you are doing it wrong. Check yourself cos it's possible you are struggling with greed.
I don't think it's greedy if someone still holds even though they have 40x profit like HEX tokens, maybe the potential to go up is still big so continuing to hold is the best option, if everyone immediately sells all the coins that have gone up then the market will certainly drop, this actually makes the market even more improve.