What do you suggest as an alternative? This is the current state of the science as far as Covid-19 is concerned. There will most definitely be different types of vaccines with longer lasting immunity [1] and anti-viral drugs [2] in the future but this is the best we have at this time.

[1] https://www.clinicaltrialsarena.com/news/emergex-trial-covid...

[2] https://www.npr.org/2021/12/06/1061902658/what-a-new-antivir...