Bitcoin has broken a key uptrend support level, according to Metrics Ventures' latest market observation. The report highlights sustained outflows and increased volume in Bitcoin ETFs, reflecting broader liquidity constraints in the market. The U.S. Treasury General Account's liquidity issues and a four-month decline in MicroStrategy's stock are cited as indicators of tightening in the dollar system. Metrics Ventures advises caution in portfolio management, suggesting investors wait for a clear inflection point, while maintaining a bullish outlook on Bitcoin's long-term prospects, dependent on liquidity expansion.