News: Bitcoin experienced significant volatility on Sunday, reaching new highs before pulling back, reflecting typical end-of-year trading dynamics. While institutional adoption continues to be a strong long-term driver, short-term sentiment is mixed with consolidation and potential altcoin rotation. Macroeconomic factors like stimulus packages provide a positive backdrop for risk assets.

Market Probabilities: 
Bull 55% | Base 35% | Bear 10%

Recommendations: 
Short-term: HOLD
Long-term: BUY
{"sentiment": "bullish", "price_direction": "up", "impact_strength": "medium", "timeframe": "medium_term", "confidence": 0.575, "key_reason": "The breach of the $20,000 mark was a major psychological and technical event, attracting significant"}