Increasing interest rates inspires caution among investors, causing an effective aversion of risk-based assets such as cryptocurrencies. Based on the CME FedWatch tool, there is a 97.1% chance that the Fed will keep the Federal target rate at 5.25% to 5.50% in the upcoming FOMC meeting, while 2.9% of the opinion polls anticipate a change to 5.50 - 5.75%.

FedWatch Tool, Source: CME
It should be noted that the degree of certainty between November 10 and December 13 has reduced. In just under 48 hours, the optimism for a steady 5.25% to 5.50% has dropped from 99.8% to 97.1% as more market watchers anticipate a possible target rate adjustment to 5.50% -5.75%.

Probabilities, Source: CME
Meanwhile Bitcoin price volatility continues to increase, up almost 5% between December 10 and 13, moving from 29.20% to 33.81%.

BTC volatility, Source: IntoTheBlock
It continues to hold thinly above the $40,000 psychological level, with investors showing caution, evidenced by the subdued Relative Strength Index (RSI).
Owing to the fact that the yields on assets dominated by the dollar reduce relatively when the FOMC reduces interest rates, investors seek returns elsewhere. As such, if the Fed raises the target to 5.50% -5.75%, Bitcoin price could move north amid growing demand. In the same way, should the Fed maintain the 5.25%-5.50 threshold, BTC price could display little movement, possibly even dropping.

BTC/USDT 1-day chart, Source: TradingView
Either way, there is a possible range developing, with a move to $48,000 still in the cards before a more significant correction, although the $37,800 remains critical for the upside potential of Bitcoin price. Losing the aforementioned level could set the tone for BTC to spiral to $32,000, or in the dire case, all the way to the $30,000 psychological level.