what does becoming sick have to do with selfishness or stupidity?
you have an immune system for a reason. when you isolate like you do your immune system weakens. after a lack of exposure to community pathogens your immune system falls back to your tuned antibody instructions (basic immune response vs targeted response from learned immunity) this ultimately makes it tougher to fight off whatever comes your way.
increase your intake of zinc, c, and d3/k2. increase your hydration.
unless you plan on living by yourself for your life in a cave in guatemala or some shit you’re going to need to expose yourself to microbes so when you do catch a bug your immune system is better equipped.
before you say it, no im not an internet doctor. years of medical training and saving lives on the ground during and prior to wuhan.