@David *******
, see that's the tricky part,
You have to meet the requirements for the extension you currently have AND the new requirements for the one you're applying for
So that means for example you would have needed to keep the 800K baht in the bank for 3 months after you got your year extension granted then never let the balance go below 400K baht the rest of the year (which are the terms of your current extension)
AND
then you need to have the 400K baht in a thai bank account in your name only for 2 months before you apply for your new extension based on marriage