T&B cells produce antibodies. They don’t “need” antibodies. Once the body has been exposed to a pathogen, if your immune system is working, they should produce antibodies to fight it. This is why we vaccinate to give an initial exposure that is contained, teaching the immune system what it needs to mount a defense, i.e. antibodies. Once that has happened the body should recognize the pathogen every time it’s exposed and automatically produce the needed and matched response. If the body hasn’t been exposed for a time it doesn’t keep making antibodies, this is normal and why you’re seeing the vaccine wane over time.
Current science tries to continually stimulate the immune system by repeating the vaccination process, in the belief that you continually need antibody production to combat a virus. Wrong!
From day one the concern was a “novel” virus.... hence we’ve never been exposed. Once you’re vaxxed or have recovered, you immune system should have what it needs to recognize Covid and fight it. It doesn’t mean you won’t catch it, can’t pass it but your symptoms should be dramatically reduced because your body now knows how to fight the virus.
Give your immune system a chance, like everything it needs to be exercised.