The idea that COVID-19 can’t be stopped and has to go in waves is based on the idea that it transmits like flu.
But COVID-19 is not flu.
COVID-19 can be stopped; it can be contained. Any second wave can be stopped too.
You can totally crush COVID19. China, South Korea have shown how. Spain and Italy are doing it now too. The WHO say this with every press briefing but the media almost never report this. To do this you test, isolate and care for cases, trace contacts and quarantine the contacts.
If you stop 75% of the transmisions you change a transmission that goes
100 cases → 200 cases → 400 cases
to one that goes
100 cases → 50 cases → 25 cases
and it soon stops.