@CryptounityCUT, if you are confident in your analytical skills, can you tell us if the current price of 27k$ is the lowest price for accumulation?
You are absolutely right that Bitcoin is known for its unpredictability and high volatility. Even the prominent experts can't consistently make correct predictions about i future price movements of Bitcoin. Hence, DCA strategy is considered relatively safe and result oriented in the long term.
In the world of investing, there will be always winners and losers, and there is not a single strategy which is 100% risk free and guarantees profit. Therefore it is important to evaluate your risk tolerance, financial situation and goals before making any investment decision.