Question. What should be the ideal response of yours when you see your investment in something goes down? If removing it is bigger loss and keeping it is psychological panic loss. How do you stay calm? How do you plan on movement when all ships start to sink? take this in context of money, people or even work or job if you can.
The key to any investment is to never invest what you can't afford to lose.
I use 3 pillars.
Asset plea, to know it's not a scam.
Trust the developers to know who they are and what steps they will take.
Public, to find out how many people are adopting the currency.
Honestly, I believe in investing and forgetting. Then when I come back later and check after 2 years, investment mostly grows unless it was a real bad decision on my part.
Even if it goes bad after 2 years, it won’t give me a set back because even I would have grown in those 2 years.
If you keep checking your investments everyday, that is surely going to give you a lot of stress. Best is don’t watch out until you plan to sell.
HODL
If you invest, it's usually for a long time (sevveral years or longer). Ups and downs are just part of the cycle, so just ride them out.
If you speculate, though, that's a totally different situation. I don't know enough to answer how a speculator should handle downturns in crypto, so I won't even try to answer.
So before you look for answers, you need to know why your spent your money on crypto (or anything else, for that matter). That answer will determine how you should proceed when the trendlines on the charts go south.