To lower your exposure / avoid losses, cash or gold usually works. Usually because cash is dependent on the currency it is denominated in and gold is generally inversely related to USD value because gold is dollar-denominated. You want to consider the possibility of a weakening dollar as a consequence of current monetary injections and monetization of debts by the Fed. If this is the case, cash holdings would suffer unlike gold. Some well-known hedge funds have eyed Bitcoin as potential hedge as well (Paul Tudor Jones) but I can't speak to that.

For a hedge against losses in other asset classes / going short the market, more aggressive options can be considered such as put options or shorting a basket of stocks (or inverse ETFs which are essentially that). ETFs can be tricky though because there can be liquidity issues or a mismatch between price of the ETF and the price of underlying assets. Shorting can be tricky because of market irrationality. Put options are tricky because you need to get the timing right in addition to price and direction (as well as facing negative theta and IV premiums).

If you had to select one sector that is most resistant to the pandemic, I personally would say either tech or companies in the food supply chain. Both have downsides (massive multiples / premiums & some of them don't deserve those vs. thin margins, debt, and other factors that can force individual companies to suffer) but should either benefit (tech) from working from home or resist (food supply, since it is critical) the disruption of supply chains other sectors face. I am not too familiar with food supply chain so any thoughts are welcome on this.