What caused this wave of plunge $ETH $BTC ?

In my personal judgment, it is highly likely due to the operation of "pulling Ethereum, selling Bitcoin"; it's obvious that large investors have rushed to exit in advance. After all, large funds are likely to want to exit before interest rate cuts, and won't wait until the last moment.

I lost money in the past two days, so I'll stop-loss and exit to calm down for now. In this market, it is not driven by technical analysis at all; it's entirely led by news, and if you miss the rhythm, there's nothing you can do but wait and see.