there is a possibility to lose your 100% of your bitcoin investment if you are a trader, as we all know trading is also part of bitcoin investment not only by accumulating and holding for long period of time, no matter the stage where bitcoin is now if you are a trader in the process of trading you can lose both your capital and your profit which can be called your 100 percent, that's why it is advisable for someone to be on the safer side, he/she should buy bitcoin and hold for a long period of time using the DCA strategy in steady of trading.
Your statement proves that you have not been able to gain any knowledge of Bitcoin investment.For which you are repeatedly mistaken, because you once mentioned that if you are a trader then Bitcoin is likely to lose investment. Again mentioned that he should buy Bitcoin and keep trading for a long time using DCA strategy. In fact, you should have a clear idea about investment and trading and even know about investors and traders. I am simply highlighting the difference between the two. Investing is a long-term process, i.e. you are buying small amounts of Bitcoin regularly and holding the investment for a long time. But trading is for a short period of time.
It may be helpful for you to know that investing and trading are not the same and you will even get a clear idea about investors and traders. See here,
The Roles of Traders and InvestorsInvesting vs. Trading: What's the Difference?