Significant immunity from infection appears to be the only way to drop the curve. The states and countries that seemed to succeed at suppression in 2020 and early 2021 are paying the price now. They didn't stop the virus. They postponed it. Corona is a total bitch, and she will have her pound of flesh.
Japan seems to be an exception. They had a huge wave over the summer, probably a consequence of the Olympics and the Delta wave. The head of the Tokyo Medical Association recommended ivermectin when the vaxx failure was obvious in late August. A few days later, the curve turned and dropped like a rock. Their case numbers remain low even as South Korea and Vietnam numbers have risen. It could be correlation. It could be causation. We'll have to watch and wait.