The S&P 500 has fallen 5 percent or more in September and October during 15 of the past 24 midterm election cycles, according to Cantor Fitzgerald data. This year's setup looks primed for volatility.

Valuation metrics are flashing red. The S&P 500 Shiller CAPE ratio sits at over 40 times—territory unseen since before the 2000 dot-com crash. The Buffett indicator, which divides total U.S. stock market value by GDP, stands at 230 percent, far above the 120 percent threshold for overvaluation. Geopolitical risk and consumer weakness add downside risk.

But a correction, if it comes, is a buying opportunity. Artificial intelligence is reshaping corporate fundamentals in ways the market hasn't fully priced in. Tech-heavy leadership—unlike the cyclical-driven leadership of past cycles—rests on fortress balance sheets and cash generation, not leverage.

Three ETFs offer direct leverage to this trend. VOO (Vanguard 500 ETF) holds 500 large-cap names with a 0.03 percent expense ratio and $1.5 trillion in assets. Over a decade, only 14 percent of active large-cap managers have beaten it. The fund posted 15.3 percent annualized returns over 10 years and 22 percent over three years.

VUG (Vanguard Morningstar Growth ETF) is the growth vehicle: 65 percent in technology, 17.8 percent annualized returns over a decade, 22.9 percent over three years. QQQ (Invesco QQQ Trust) tracks the Nasdaq-100 with similar tech concentration (65-plus percent) and steeper returns: 20.8 percent over 10 years, 24.5 percent over three years.

For defensive positioning, XLU (State Street Utilities Select Sector SPDR) holds NextEra Energy, Southern Company and Duke Energy. The 0.08 percent fee and 2.8 percent dividend yield provide ballast during selloffs.

The next six weeks will test nerves. Buy the dip in these funds if weakness arrives.