Unless you’re using leveraged ETFs, if TQQQ was around in 2000-2003, it would have lost 99% to $1, but you would also have been a mega millionaire now if you were able to buy.
Ditto--Would not swing short this Mkt--only short tops of a Nice Falling Channel ----as long as Mkt stays above Da SPX 30 Min Red Line---Bullish ! ( Intradays another story ! )