What should I do if I missed the extension criteria for my Thai retirement visa after reinstating my bank balance?

Time to find a good agent.

You'll have to see an agent now. I'm sure they can save you but you are buggered to get it done yourself now. You'll have to start from scratch. Good luck

An agent will sort you out for a fee.... This is the best I know

@Luckchanok *********

, but you don't say where your located, they are in Pattaya.

Contact the Thai visa centre I'm sure they can help

You may need to consider using an agent. The fact you actually have 800,000 bht in your account when you apply for your extension will help although will still cost you. Better that than have to leave thailand and return. Make sure you abide by rules for following year then no need to use an agent again.

If you let your balance drop below 800,000 at any time within the 3 months after you received your 1 year retirement extension then you'll not be able to get a new 1 year extension as you broke the rules for your previous extension.

You'd need to leave Thailand (not necessarily to where you're from) and either apply for a new non-O visa outside of the country or return as a tourist and apply for a new non-O visa inside the country.

You said you replaced the money you took out from your account so beware that many immigration offices have a requirement that you can prove your 800,000 was transferred from overseas in order to apply for the initial non-O visa from within Thailand.