Okay, do what's your play, here? You sit 2021 out, the s&p froths up to 5.5k over the next 18 months, and then crashes down to 3.7k? And you perfectly time buying the dip? (Unlikely.)
You'll still lose money, compared to just buying and holding.
You'll still lose money, compared to just buying and holding.
Also another great thing to try is get SPX/USD on 500:1 leverage so on a good day when S&P goes up 2% with the leverage multiplier can significantly increase return.