Some events acted as catalyst too. In my opinion the US debt smashing through $40 trillion was a strong catalyst itself. A lot more people lost faith in fiat after that...
This is one of the reasons, perhaps the biggest, but not the only one. The weak dollar showed itself to the markets both in terms of its ideology (unsecured paper) and also by the fact that gold and bitcoin are traded against it, and this contributed to the rise of these assets. Well, plus the ETF flows, which steadily poured into the liquidity of bitcoin. And even though the price growth has stopped now and is testing 800,000-81,000, there is a positive sign about Glassnode: they noticed that the bitcoin options have prices of 81,000-86,000. This means that bitcoin's growth may continue higher.

Nearly $2 billion in Bitcoin ETF inflows last week — this is the most dominant factor and the one with the most verifiable data. The 22% rally from around $63,500 to $80,000 in such a short span was primarily driven by strong spot ETF demand, which was then accelerated by massive short liquidations (open interest fell ~11% to its lowest level in a month). The CLARITY Act and Treasury liquidity support helped build momentum since mid-August, but weren't the direct trigger for this week's breakout. Meanwhile, CFTC/SEC rule momentum has little supporting evidence as a catalyst for this period.
The passing of the Clarity Act has been dragging on for a long time, and it is remarkable to see the growth Bitcoin has achieved without the support of this legislation or any highly positive news regarding it.