Could have, would have, should have does not work when trading crypto. OK, so when it was at US$37,000 and you bought it, as that moment, how are you 100% certain it would go up ? It would have even gone down to US$36,000 or below. Seeing any past performance charts in crypto and thinking "I should have", "I would have", "I could have", does not work in crypto markets. Bitcoin price is being totally controlled by the big whales and NO ONE can correctly predict at any moment, what the price would be even after a minute. At the most if one bought at a certain price at then the price drops, one has to panic sell or hold and that hold can be days, weeks and sometimes a few months.
@onlinemarketer12 is correct by saying that you have less knowledge about crypto trading.
Start trading with a small amount like US$100 and you'll understand within 2 to 3 days that "I could have, would have, should have" does not work in crypto trading based on any past performance whatsoever.
We are not discouraging you. We don't like seeing people lose any money, without atleast initially knowing the ways things work.