Following Trump's announcement, key Fibonacci retracement levels acted as significant support and resistance. For Bitcoin and Ethereum, the 38.2% and 61.8% levels were particularly notable. During the initial surge, the 38.2% level often served as support, reflecting a shallow pullback where buyers re-entered, driven by strong bullish sentiment. Conversely, the 61.8% level acted as resistance during retracements, indicating a deeper correction where profit-taking occurred. These levels are psychologically significant to traders, aligning with natural market behavior and historical price patterns. Their effectiveness stems from widespread use, making them self-fulfilling indicators in highly speculative markets like cryptocurrencies.