What are my options if my COVID-19 extension expires before my new flight date in Thailand?

You have two options:

1. WAIT until around the middle of March, and see if they will extend the 60 day extension of stay based on unable to travel due to COVID-19. If they do, then apply for that OR;

2. On March 22rd, go to the immigration office and apply for another extension of stay. It will be rejected, and you will receive a 7 day extension of stay denied stamp. At most immigration offices, the extension of stay denied stamp begins on the date you apply for the stamp.