Taking 3 sinovac shots is better than mixing with pfizer.

https://www.channelnewsasia.com/singapore/covid-19-vaccine-sinovac-third-dose-moh-reminder-2353536

Our government is encouraging Sinovac takers to switch to mRNA but this is the wrong approach and it is being debunked by a scientific study.

https://asia.nikkei.com/Spotlight/Coronavirus/COVID-vaccines/3-doses-of-Sinovac-is-better-than-mixing-with-Pfizer-Turkish-minister

A Turkish study of more than 30m citizens showed that consecutive doses are more effective than mixing with mRNA.