FEIE: Do I need to revoke after moving back to US?

Hi. I used FEIE for tax years 2019 and 2020. I moved back to the US in November 2020. If all my income in 2021 is US sourced, do I need to revoke FEIE? Am I allowed to use FEIE again in 2022 or do I have to wait 5 years?

Thanks for the advice! Much appreciated.