How can I resolve my visa situation in Thailand without leaving the country?

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You do not need to leave the country. Go to immigration to get a new non o.

Easy to do locally if you can fulfil the $$$ requirement ... and no insurance needed 👍

Just apply for a non-o and extend much better no insurance required

ok dunno what you did last december but you didn't renew anything 😕

You either exited and re-entered the country to get a new year entry stamp OR you went to the immigration office paid 1900baht and got a year extension of stay <- if you did that you are correct extensions are sold with NO re-entry permit because you're already IN thailand when you get it and that means after you get the extension you would have had to buy a re-entry permit if you were going to exit/re-enter or your stamp would cancel when you left.

So let's just go under the premise that when you stamped out what ever you had was cancelled 🙁

AND

I doubt you were let in on a "tourist visa" (seeing as you BUY a tourist visa from a thai consulate before you come 😮 ) so more likely than not (depending on your nationality) you would have gotten in on a 30 day visa exempt entry.

What you need to do is get on over to your immigration office and apply for FIRST a 90 day Non-O visa based on retirement <- by meeting the proof of funds and supplying the correct documents.

That costs 2000baht and will go under review at most offices for 2 weeks. Then you go back and get the Non-O visa and a new 90 day stamp inked into your passport.

After that you wait until you have 30 days or less left on your new 90 day stamp AND the 800K baht in your thai bank account has been in it for 2 months and you go apply for a year extension for 1900baht. It will be issued that day.

THEN you BUY a re-entry permit so you can exit/re-enter the country and not cancel your stamp when you leave 🙂