This is a phenomenon which is not uncommon in viruses. The reason is that a virus which is too deadly, has less survival chances. The flipside is that Covid will likely never entirely go away, but it is increasingly counterproductive to take it so seriously that one cannot go on with life normally. The imploded lethality rates since April while positive tests went up, prove exactly that point.
https://www.rt.com/op-ed/499544-covid-19-fetishising-science-normality/