Personal responsibility will not save you;
…But wearing a full-face respirator with P-100 HEPA cartridges every time you’re out in public will.
No, seriously.
I wore a respirator through the first year of the pandemic. Almost everyone I work with caught it; my immediate boss–who is a duller-than-a-sack-of-hammers anti-vax dumbass–caught it five times, and I didn’t get it until after the first vaccine came out (…and I got vaccinated just as soon as it was cleared for the general public). Once I wasn’t wearing the mask all the time, then I got it. Is that real proof? No. But that kind of thing will sharply reduce your risks.