While it’s encouraging to have a higher number associated with the Covid test when checking for antibodies, it’s no guarantee of immunity. A positive SARS-CoV-2 spike protein test just shows that your body has been exposed to the Covid-19 virus either though having the virus or by getting the vaccination and is making the appropriate antibodies to recognize it again in the future. But it won’t show the effectiveness or longevity of the antibody protection. Conversely a patient may show a low antibody number but still some immune response if exposed to the virus.

Antibodies are just one part of a complex immune response that is triggered when a person becomes infected with SARS-CoV-2. The presence of antibodies does not mean that they are there at a high enough concentration to provide protection from reinfection. Just as the lack of antibodies does not mean that the immune system is not primed to respond to reinfection.

What is most important is the adaptive immune response. The adaptive immune system is responsible for the long-lasting response. It activates your body’s T and B cells, which learn to recognize specific foreign materials. The T and B cells are the ones that then identify the foreign material months or years after the initial infection or vaccination and generate the antibodies to attack and eliminate the invaders.
Unfortunately testing the body’s T and B cells for Covid antibodies is difficult.

If I remember correctly, you had a low or zero score after your last SARS-CoV-2 test. Are you considering having another test run just to see if your numbers are up?