Daily switch: if the broad U.S. market (VTI) rose yesterday, go all‑in TQQQ (3× Nasdaq‑100). If it fell, park in BIL (T‑bills). Tries to amplify up days and sidestep down days; very aggressive with high turnover and tech‑heavy exposure.

Each day, it checks whether VTI—a fund covering the whole U.S. stock market—was up yesterday. If yes, it puts 100% into TQQQ, which targets 3× the daily move of big Nasdaq tech stocks. If no, it moves 100% into BIL, a cash‑like Treasury bill fund. Rebalances daily.

Bold risk-on/risk-off sleeve: 3x Nasdaq on up days, cash on down days. Out-of-sample results show larger drawdowns and negative returns vs the S&P 500, so best for very risk-tolerant investors seeking tech-led upside as a portfolio complement, not core.