What visa options do I have in Thailand without leaving the country as an expat married to a Thai citizen?

I personally haven't seen or heard of anyone going from an Elite entry stamp or extension to a Non-Immigrant Type visa inside the country :/

It MIGHT be able to be done by cancelling your elite extension applying for a covid extension (which you have until the 30th of March to do) and then applying for an in country Non-O visa

BUT

I'd make damn sure that would work at the immigration office BEFORE you cancel your elite extension and jump on the covid extension bandwagon

My advice: contact your local immigration office or the Thai Elite visa and ask them.

For an extension of stay based on marriage to a Thai national, you will need a monthly income of 40K THB or 400K THB in a Thai bank account seasoned for two months. I do no think you can get a non-O visa based on marriage inside Thailand.

For an extension of stay based on retirement, you will need 800K THB seasoned in a Thai bank for two months OR 65K THB in monthly income. You can get a Non-O visa based on retirement/ over 50 years of age at some immigration offices.

It will be VERY difficult to get a Non-B visa or an extension of stay based on employment inside Thailand especially if you own a business.

I don’t see the value in keeping this post open.

His question is - what can he do without leaving Thailand?

I read the other week that you can extend a 5 year Elite to a 20 year Elite for just 400k (or maybe 500k in your case) extra. I know it’s not really what you asked but just thought I’d mention it incase you believe it’d cost you another 500k for just 5 years

You should be able to do a conversion to non immigrant. If marriage is an issue Non Immigrant O for retirement is an alternative

Keep it simple...

If you are married to Thai get the Non O and its extension of stay for one year as married.