keep on the BTCUSD upward support line of the daily K-line cycle

If Bitcoin wants to maintain the long advantage Trend in short-term, its upward support line of the daily K-line cycle can not be destroyed. further step,or it should not fall below yesterday's lowest level of 3791. if so,it will shake the foundation of the upward trend and destroy the trading sentiment of the market, so the short-term future market will usher in a negative decline.