First off, I don't think right now is a good time to sell just for health reasons. I wouldn't sell in person, and selling online still means increasing the number of times that people have to come in contact with each other to deliver what you're selling.
When we get the all clear on social distancing, it depends on whether or not you'll buy it back later. If it's stuff you're just going to buy back later, keep it. You'll probably lose more money selling and buying than you will make in the market. If it's stuff you don't actually need, you should sell it and invest the money regardless of what the market is doing. Even with the big drop the S&P 500 has only been set back to 2017 prices. If it's stuff you could have sold in 2016, you'd be better off having done it then. Nobody knows the future, but your chances are always a little better now than later.