No one can guarantee to earn profit through investment. Because there are many types of risks hidden inside the investment that cannot be understood from the outside. So if I want to invest, I have to be aware of all aspects of the business that I am going to invest in and I have to invest with a long-term plan, otherwise there will be a high chance of loss after investing. I have to think ahead, never think of investing money that I can't afford to lose.
investing in bitcoin does not guarantee 100% that you will make a profit because the price of bitcoin is very volatile so it cannot guarantee whether you can survive in the market but if you do have the intention to invest in bitcoin it is highly recommended to choose long-term investment, and what you wrote is very true, so that your mind is calm then invest with money that you can afford to lose
(make it a habit not to use emergency funds or borrowed money bcause there have been many stories where a person who invested with borrowed money had to resell his investment assets before even making a profit because he had to pay off the loan)