Bitcoin is one of the few assets where people prefer to buy it when it is expensive over when it is cheap. It becomes a lot easier to handle when you treat bitcoin as long term savings or long term wealth, instead of as an investment.
If the money you put into BTC is money you dont need for 4+ years and you set your mind to it being a way to build as much wealth as possible, then BTC dropping in price means 'wealth is on discount'. Some people prefer to buy wealth for top dollar, others like my self prefer buying wealth on discount.
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