This is simple, the current wave and trust of the Bitcoin market was established by the US presidential candidate, Donald Trump. If they change their mind about the current situation of the market and refused to make amendment to make Bitcoin a safe investment in their country, there will be sell off from investors and lack of interest in the market, and if they ban it, that's the end but this is very unlike to happen, they might want to regulate it though.

The second people that can makes the market plummet is if Microstrategy and Blackrock start selling their Bitcoin on the market, know that the end of this cycle has come to the end, there is nothing that is going to stop Bitcoin from crashing because this two institutional investor's are the main black force behind this run including Elon Musk. If tesla decide to dump the rest of their billion worth of Bitcoin, there will be mix emotion among investors.

Lastly, if Satoshi wallet wakes up and send everything to centralized exchange, that's the end of Bitcoin. This is the least that will happen to the Bitcoin market.