I am not sure how you think the mutation of strains forming more varied genoms less able to respond to a single vaccine is an example of the OP.
Obviously the OP's later comments about engaging more with preventative care is certainly valid, the idea that we can eliminate viruses that way is simply not factual and an example of a flu recombinating into new forms (strains) is hardly a good example.
If you want a good example of preventative care eliminating a virus you can look at small pox, which we did eliminate and not just rearrange the strains.
The problem is neither the flu nor small pox is representative of COVID so sadly while we knew small pox could be eliminated once the science understoof the problem we likewise know COVID (like most viruses) cant be with current tech.