Oh, don't let people fool you about the antibodies. Your immune system has life long memory defense now in the T-cells. The same T-cells that protect you for life after recovering from the chicken pox, mumps, measles, etc.
From the NIH. That most politicians will never quote from, nor Dr. F, nor the CDC.
National Institutes of Health is the primary agency of the United States government responsible for biomedical and public health research. It was founded in the late 1880s and is now part of the United States Department of Health and Human Services.
NIH says there is long term, long lasting immunity once recovered. Even better than a vax.

So you and others are real winners!
Much of the study on the immune response to SARS-CoV-2, the novel coronavirus that causes COVID-19, has focused on the production of antibodies. But, in fact, immune cells known as memory T cells a…
directorsblog.nih.gov
The people with hidden immunity against Covid-19
T cells are a kind of immune cell, whose main purpose is to identify and kill invading pathogens or infected cells. It does this using proteins on its surface, which can bind to proteins on the surface of these impostors. Each T cell is highly specific – there are trillions of possible versions of these surface proteins, which can each recognize a different target. Because T cells can hang around in the blood for years after an infection, they also contribute to the immune system’s “long-term memory” and allow it to mount a faster and more effective response when it’s exposed to an old foe.
Recall the Tide laundry commercials that said, in order to get protein stains out, you need to use protein. It's on that same level.