volume concentrating

$Bitcoin (BTC.CC)$ an interesting trend I've noticed is how volume has been concentrated into the US regular trading hours ever since ETF approval. This makes sense because etfs only trade during us trading hours. however, the effect seems to be more than you'd expect based on etf volume alone, suggesting that traders are deferring trading in order to take advantage of tighter bid ask spreads while the us market is open.

I don't really know how to make money off this... if you have any ideas let me know👇