You entered on a Non b teaching visa ...during this COVID CoE approval process.
And to get that... you had to be approved for the visa by your employer school and Education Ministry and your name placed on an approved list to obtain permission to enter Thailand
Are you no longer teaching?
If you are still in first 90 days...
As
@Tod ********
stated...
Go to Thai Immigration to apply for the 60 day COVID extension.
The last day to apply for it is March 30.
But please recognize it is difficult to regain your Non B teaching visa inside Thailand once you give it up.
So choose wisely.