I go about promiscuously, un-‘protected’ (except by my state of mind), happily breathing the same air everyone else is breathing.
My idea is to catch each mutation ASAP, and get the extra immune-library addenda which the ‘virus-variants’ - or useful, benign exosome messengers, perhaps? - offer to us all. That’s what having herd-immunity against an endemic minor life-threat means, in practical terms.
Been doing this all my life, with excellent results. And of course, if the messenger you catch happens to shake your state of wellness up a bit, in passing - because you happen to have let yourself get below par healthwise - then there are by-now-well-proven helper-medicines which assist you to integrate the new information into your system without too much suffering. Certainly - unless it’s your time - there’s no need to be rushed to death’s door by the messengers.
Ultimately, we maintain our natural strong immunity by eating, living, and prophylacting prudently (no need to expand those rules, as most now understand what they mean), by avoiding as far as we can the widely-dispersed pollution-poisons which our mad society has been spraying around for decades;
And by maintaining the proper mind-state, of course.
Anyone who’s au fait with the current very high level of experimental evidence for direct PK effects on the physical world induced by our interior mind-activities will understand that the ancient shamans’/mages’ insistence, that what goes on - habitually! - in mind directly affects what goes on in world, is now confirmed by modern top-quality scientific work. (Still rabidly resisted by the present crop of gatekeeper scientismic gocos, of course.)
I used exactly this approach thirty years ago when touring Indian cities with an invited company of thesps from Leicester Haymarket, showing Shaksper and Stephen Spender plays to audiences of avid Indian literary afficionados. The total touring company, with actors plus all the other essential workers was forty souls. I was literally the only person who refused all prophylactic injections and drugs, and trusted instead to the ancient shamanic approach touched on above. I was also - literally - the only member of the company who never had a hint of illness during the whole tour. Several of our company got so ill, despite all their line-toeing medical hoop-jumping, that they spent time in Indian hospitals. We are designed to be robustly well, so long as we don’t eff it up with long-sustained health-killer habits - or inappropriate pharmaceuticals.
I also happen to believe - from repeated experience - that, if you stake your life on your knowledge - like Carlos Castaneda and his fellow-apprentice leaping off a cliff together* - this degree of commitment tends to make your personal magical results more beefy… perforce! 
*Take that story literally or metaphorically, as you prefer. Since none of us were actually on that mesa in Mexico in the 1960s, we’ve no way of knowing for sure which it was; but hold your horses a little before you start asserting - a priori - that there’s no such thing as levitation: the real thing rather than the illusionist’s trick, that is. There is; I’ve witnessed it… 
