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?
I think, you are not wrong with your step because everyone has its own strategy on earning money. That's your strategy to earn more, but you can't predict when the bitcoin price will increase or decrease. you need to check everytime the value chart of bitcoin to know when you will exchange your coins.
He is very wrong with his step, he didn't even bother to make a better research. All times high is known, it's over 15k dollars, but there is accurate price, like for bottom, price under 10k dollars is for months already. This newcomer wants clean profit, but how much is he prepared to wait, is he prepared for that?
There are many factors that needs to be considered before anyone invest money into something. I support investing in crypto, but at least learn about what you are investing in, don't do anything blindly. Deeper research will make your risks lower, with that your mind will be calm. And if you are a long term investor, don't watch prices everyday, you will just be crazy and full of doubt whenever price is dropping like its happening this year, invest, put coins on the safe place and wait for big news.