I am more pessimistic about this issue( A new wave of coronavirus will come to us several times a year. And we will have to adapt to this and continue to live next to these kinds of infections.
I read that those who got sick with coronavirus do not get immunity and there are already cases when they got sick again.
I'm even more gloomy on that. There will be no waves, just continuous course of COVID. Acquired immunity doesn't last for long (various studies speak of one - two months), therefore there is a little hope for the vaccine being developed. One hope remains to appeal to Mother Nature. But she’s still playing against us. BTW, do you know that virus strain circulated among Europians is more severe than that one which is spreading in North America? Soon we’ll be wearing space suits.
With the coronavirus virus, a mutation occurs and as scientists suggest, it should weaken over time. But in any case, it is only possible to stop the spread of the virus after creating a vaccine, not a drug. But as I see from the news, we are still far from launching such a vaccine, and we don't know what the cost will be.