Rare formation on BTC/USD

Hi, I look quite a long time at BTC chart - all I can see just now is a rare formation on 4H - right-angled ascending broadening wedge.
Meaning of such formation is dubious, but this time I'm pretty sure, it's a reversal pattern - will short BTC.
Target around 21500.

Cheers...
Chart PatternsWedge

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