I have always practiced social distancing (hard in subway) and avoided touching my face. For the past 20 years I have also strengthened my immune system with supplements.
At any moment I could be killed by any number of means. I still go out.
Mega dittos. Most of my last 40 years was working in NYC and around the NY metro area - never took the vaccine, never got a severe flu case.
I think when it comes to flu and corona-like viruses, there is no substitutes to good health and a good immune system.
The immune system was not designed to protect you from all the things the system knows about. It is designed to protect the body from all biological strangers. Yes, it will develop particular antibodies based on previous attacks, but those antibodies came from the immune system fighting off something new - which is what it was designed to do.
I am not uncertain that some vaccines inhibit the development of some natural immunity. Why? A sister of mine together with her daughter have gotten the flu vaccine religiously every year, and every year they both get a sever URI illness.