Immunity is more than antibody specific immunity. There is very little discussion of cellular immunity. Although it appears there is temporary immunity to original strains, I doubt the immunity will be very good as the virus mutates.
The long term effect of repeated MRNA boosters will be a disaster. All that spike protein floating around.
There was a study from around 2014 that looked at Ivermectin and its method of action. The content of that study was a little over my head but they suggested ways in which it modulated cellular response to infections. The good thing about IVM is that you take it for a few days and then stop, and it will be flushed from the system a few days later. It may not be bulletproof against Covid but too much evidence supporting its use is out there for these jerks to keep refusing to study it and pretending that it’s a danger.