1. if you see that the price is starting to fall and you are already at a loss, sell 80-90% of the coin immediately with this action, you will have money reserves, if the remaining 10%-20% falls, you will be able to buy it again with your 80-90% money reserves. (It work like magic - allmost)
I disagree with this approach. If you have already lost 90% of the value of your asset, then lose it completely. It is true that it may seem smart to exit even by 10%, but from the beginning, do not invest in an asset that you are skeptical about, or at least withdraw from the first 10%, but since you waited until price has dropped by more than 50%, so time is already running late.
In principle, I agree with you, but it depends very much on the type of trade. For short-term trades (< 24h), I personally don't care what asset I'm trading. As a rule, I don't know much about the coin, I just look at the relevant charts (or am made aware of the coin in question by trading groups).
For coins that I hold long term, the situation is of course completely different. Here, however, I usually don't mind -90% price losses (to the ATH, not to my investment of course), as I personally always assume that the coin will recover - otherwise I would have sold much earlier.
However, I usually only take such losses with coins where the staking returns are comparatively very high. An example for me here is AVAX (Avalanche), where holding out through the trough from 2021 until now has already paid off again, as enormously good returns were paid out in staking rewards.
