emotions can easily take over when you see your money dwindling down. The part where you shouldn't invest what you can't lose is probably the best answer to those people panicking when the market is bearish. It's not an overnight thing guys.
Op stated the basic which I consider as theoretical aspect of trade because when the practical sets in and as you said " your money dwindling down" , then comes emotion and panic not to lose all.
Yes, these are just the basics. At least, Op gave advice to those who are still new in cryptocurrency and may also be beneficial to those who are experienced enough in crypto world. But in reality, panic is a natural feeling when a situation is most likely in an uncertain circumstances.
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2. Do not even think of selling you bitcoin or ethereum
Why not? If you've already gained enough profits. Then, why don't you sell your btc or eth? We can still buy them when the price is in dump stage. FOMO enters this kind of advice. But still, there are still settings that may be helpful and useful in other situations.