Fractional shares would work, if you don't want the expense and unreliability of shorting. Simplest thing would be to find an actively-managed mutual fund that

Fractional shares would work, if you don't want the expense and unreliability of shorting. Simplest thing would be to find an actively-managed mutual fund that focuses on what you want. (Warning: What you want is probably to lose money compared to the rest of the market.)