Cases and deaths went down this time last year without vaccines, and without reducing CT counts on PCR tests.
deaths appear to be flat lining now. https://www.worldometers.info/coronavirus/country/us/#graph-deaths-daily
COVID-19, like most coronaviruses, appears to have seasonal peaks and troughs.
Deaths are flat now in the USA, but cases have been dropping 2-3 weeks. Deaths tend to lag cases by a few weeks.