Candace Veach, MTOM, LAc Answers
1) Boost Immune system - many ideas below; 2) Make your body a hostile environment for pathogens - garlic/honey mentioned is good - take it daily 3) Avoid getting sick by following distancing rules, using gloves and mask when visiting stores for essentials, and disinfecting everything that comes in from outside.
There are stronger ways to boost immune and make your body a hostile environment in Chinese herbal medicine but they are not so easy to get.