All-in, all-out switch: buy TQQQ (3x Nasdaq-100) only when the last ~2 months have been calm; otherwise sit in BIL (short-term T‑bills). Seeks big upside in quiet tech-led uptrends and safety when markets get jumpy.

It checks how “bumpy” TQQQ has been over roughly the last 40 trading days (~2 months). If day-to-day moves have been calm (typical daily wiggle under about 5%), it puts everything into TQQQ (a fund that aims to move 3x the Nasdaq-100 each day). If not, it parks everything in BIL (short‑term US Treasury bills). It switches when this condition changes.

Volatility-timed leverage sleeve: go 100% TQQQ in calm markets for potential upside, else park in BIL to curb risk. Out-of-sample results show negative returns and larger drawdowns vs the S&P—best as a tactical ballast, not core exposure.