There are several ways to boost your immunity. For example, you can monitor your diet, exercise, quit all bad habits and take vitamins. You can also find immunomodulators on this medical portal Canada Drugs that will help you activate your immunity. Against the background of the coronavirus epidemic, I wouldn't advise you to undergo immune therapy, but you can find pills that increase your body's resistance to infections. Read more about it, I'm sure you can find something that really suits you.