Yan Fei's previous moves not only targeted The United States of America's economic strength but also aimed to suppress its high-tech development speed. Of course, such tactics would take a long time to be effective, but as long as he persisted, the USA's high-tech and economic strength would surely decline further...
The next goal for Yan Fei was to strike at the US Dollar Hegemony. If he could dismantle the US Dollar Hegemony, then the US economy would collapse completely. At that point, the USA would truly be weakened in all respects.
The US Dollar Hegemony is complex, but in simple terms, its essence is the Petrodollar. That is to say, the USA forces other countries to use only US Dollars in oil transactions, requiring oil-demanding nations to access the US market with their products to obtain US Dollars, while oil supplying countries can only receive US Dollars after selling oil, and then invest these dollars in US Treasury bonds.