I have seen the price of bitcoin is very high and has exceeded 15000 $ for one bitcoin, and now the price of bitcoin is under 10,000 $ and maybe this is my chance to buy bitcoin as much money as I have and hope to get enough profit for my economy in the future.
am I wrong with this step?
Bitcoin now is under 4000 $, do you get a profit? I think you have lost money, except to maintain up to a long time until the bull comes and the market starts to get excited, we don't really know when to enter and when it's time to get out. This market condition is quite boring, putting only part of your money and giving it up if one day you lose is the best choice.