A tendency arises among us. When the value of Bitcoin increases a lot, we start trading more. Which puts our trade management in jeopardy, during which most of the time people face loss.
Trading is something that can't be done without enough knowledge and one can't expect to start trading and earning profits without even analysing the market and possible opportunities no matter what market conditions are.
Let me give you an example. Every cryptocurrency has one up point and one down point, and if you understand that coin very well, you will know when it is time to buy and when it is time to sell, so whether it's a bull market or bear market, you can keep trading. If Bitcoin is at $61k, this can be a buying point, and once it reaches $70k, that will be a selling point for a trader taking a small percentage of profit.
So, people mostly face losses because of them having no knowledge about the market.