I have made two lifestyle changes in response to covid-19.
We don't yet know how closely Covid-19 mimics the life-cycle and biochemistry of the common flu. Vitamin D has a strong protective effect
against being infected by the common flu. Perhaps it is similarly effective against Covid-19. My current strategy -- in addition to getting sunlight whenever it is available, over as much of my body as possible, to make my own vitamin D -- is to supplement with vitamin D.
In addition, due to my general deficiency of Zinc, and it's reputation for reducing the duration of respiratory illnesses, I am supplementing with zinc.
At some point, I may apply strong peer pressure to my friends and family to do likewise.
If/when the virus enters my local community, I will endeavor to get plenty of sleep, which seems to be strongly protective against infections.