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For the people, who argue that they cannot lock $1000 for year then they should plan up for $50 or $100; that is very basic. If we stick with basics of investments then we can easily convert deep bear markets of bitcoin into moderate ones.
Personally, short/long-term investment of BTC varies on its price on the market. It is definitely absurd to think that if a person plans to HODL long-term but the price of BTC exploded like a week from the time he invested, then it is a no-brainer for that person to sell majority of his coins for profit.
Either focusing on short/long-term investment, people should study the actual market and determine a threshold in the price they want to sell their coins.
In the abovementioned example, let's say a person purchases $100 worth of BTC and the latter's price exploded after a week making his investment from $100-$300, then he should sell it. If he HODLs for long-term and the price decreased, then a loss would be incurred due to the decision of HODLing "long-term."