A multi-pronged strategy. Not putting all your eggs into one basket. Just like how the many layers of your immune system work.
Vaccines are working for symptoms. Great.
Worried about infection? Masks, social distancing, etc. still have their place.
But if the symptoms are covered, asymptomatic infection isn't so horrible as long as you avoid spreading it to the unvaccinated. Exposing other vaccinated people isn't so great either given mutation possibilities, but you gotta live.
Or if you're so worried about infection even with milder symptoms (a bit silly given we don't do this for the flu), maybe take the harder route and consider developing a vaccine that's primarily tested against infection rather than symptoms.
And instead of putting all measures in prevention, how about expanding efforts for detection, tracing and treatment? Make PCR tests or their equivalent faster, cheaper, and more reliable. Covers the unvaccinated but also the asymptomatic vaccinated, unlike vaccine passports.
Invest in better tracing options so the infected can be made aware privately.
And develop interventions so that those that are infected and start showing symptoms have reliable therapies to ensure they are back to healthy quickly.
We're basically betting the house on 29 black and constantly spinning the wheel. One slice of
Swiss cheese is not enough.