The price fell very rapidly, so the reason must be very particular, and not merely volatility. So let's look at the news.
CNBC is ridiculously tying the drop to Omicron, even though Omicron is clearly not a big enough deal, has not reason to affect Bitcoin, and is only a variant of concern that was also announced almost two weeks ago, whereas a drop was swift and happened today.
Bloomberg does something very similar, but also mentions a general tendency of unstable financial markets, and a potential clue about Singapore. I couldn't find anything more, but I believe that for a quick drop like this, there must have been a direct event (news, probably) that caused it. What's that about private wallets? I didn't see anything about it online but this sounds like FUD that could potentially result in a drop like this.