First off, I need to point out that you are committing the logical fallacy of selective rigor. An increase in neutralizing antibodies is not the same as a clinical trial proving efficacy, but I'm pretty sure that increases in neutralizing antibodies STRONGLY correlate with vaccine efficacy, across different diseases. So you've already called out your own bias.

So, here is a pre-print that does show real-world effectiveness (as opposed to efficacy). https://www.medrxiv.org/content/10.1101/2021.11.15.21266341v... And of course I know that you will apply your selective rigor by pointing out that it is a pre-print. But less-biased people will realize that science can only work so quickly.