>>60502699you've got much bigger balls than me; I hold as little cash as possible because I don't want to miss out on gains or dividends, and I don't want my wealth to shrink from inflation.
I get my excitement from investing in a bunch of different companies instead of index funds. So far I've slightly outperformed the S&P 500 over the last eight years. Separately, I also hold bitcoin.
Anyway if I had your big balls, I would wait for the S&P to drop 20% from its peak, then buy a triple-leveraged S&P fund like SPXL. Hold until the S&P hits a new peak. Then sell and repeat the process.