go back to basic. we know Covid-19 is pandemic. Virus spread easily and very fast, mainly through contact. so the easiest way is to avoid contact. Stay at home and all members of family must be very strict on contacting others. avoid crowded area.

https://www.forbes.com/sites/alicegwalton/2020/06/13/face-masks-may-be-the-key-determinant-of-the-covid-19-curve-

As states reopen amid the ongoing Covid-19 pandemic, many are documenting still-rising levels of new cases. This is partly, or largely, due to bad pandemic-time behavior—that is, not wearing masks and not social-distancing. Even in New York, which has done so well in reducing its numbers, people are getting weary and a little sloppy with protections. A new study out in the journal Proceedings of the National Academy of Sciences finds that among all the strategies for reducing transmission, wearing a face mask may be the central variable that determines the spread of the virus.