I'm pretty sure my bodies just built different at this point, like I've had multiple people in my family catch it, multiple people in my house at uni and I tested pretty frequently even when I wasn't showing symptoms until they stopped giving the tests away for free, but I've not tested positive even once
I somehow dodged it until earlier this year and it barely affected me. Just woke up now at 6am and I have it again lol. The rest of my family spent the last week dealing with it and now it's my turn again.
Given how contagious omicron and later variants were, no one avoided covid without total isolation. At most you never tested positive.
I actually only know three people who've gotten it and two were not vaccinated