Narrowing triangle on the BTCUSD chart

The BTC chart is showing a diminishing triangle pattern after reaching its ATH. Volume is low currently, but RSI indicates a balanced market. MACD is also very close, and we can monitor for a break out from this pattern.

If volume keeps dropping, and the price drops below lower triangle line, we may see some significant correction. Last support line was at $12,000.

Thoughts?