The central banks increasing interest rates.
All the other stuff about 'over valuation' etc. are essentially red herrings to distract from just how fundamentally 'central bank interest rates' determine where money flows to in the markets.
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...