BTC declining OBV and rising wedge and the expected BVOL spike

Recent ATH has been impressive, taken many by surprise. Part of the surprise in the rise since July 30K bottom has been due to the declining volume, volume decline and price pushes further up. Notable that the on-balance volume has produced a significant divergence since April's ATH.
Bitcoin volatility has been on the decline and in a narrowing range which usually result in a volatility spike and an explosive move.
Considering that price is in a rising wedge with bearishly divergent daily OBV, I am expecting a big dump toward the 40k support.

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BTC fell out of the wedge with a failed retest