What are the steps to convert a Non-Imm O visa to a marriage or retirement visa in Thailand?

BTW if your planning to work you can't on a retirement visa/ext, but can on marriage

Retirement visa need 0 baht in bank 3 months before visa 3 months after. When you apply for first extension in 12 months time. Marriage visa only need 0 in bank

You've already got the visa, Non Imm O(marriage/retirement visa). You need to open a bank account, season 400,000bt for 2 months and apply for a 1 year extention of stay based on marriage. Or season 800,000bt and apply for a 1 year extention of stay based on being over 50.

Conversely the up side for a yearly marriage extension US: you only bank 400K baht in the account for 2 months before you apply and you keep it in there only during the 30 day under consideration period, then you can do what ever you want with the money.

The down side IS, when you apply you get a 30 day under consideration stamp, during that 30 days the immigration office will send people to your house to do an in home visit (to make sure the marriage is on the up-n-up) THEN you go back to get the year extension inked in.

Okay, the up side of the yearly retirement extension IS; it's issued on the spot, no under consideration period at all. You meet the requirements and you get the extension stamped in

The down side IS if you're using banked money method to meet the financial requirements you need to have the 800K baht in the bank for 2 months before you apply, it needs to stay in the account for 3 months AFTER you get the extension and then the balance can't go below 400K baht the rest of the year.

I think you need check your visa. You should have had 3 months on entry with Non O. If arrived mid January should be good till mid April

This gives time to get money in bank for the two months

As soon as you get out of quarantine go, with your wife, to immigration. Take your marriage license with you, and copies of your passport, and her ID card. Tell them you want to apply for a type O visa extension based on marriage/Thai wife. They should issue you a 90 day extension in order to get everything in order, and get your bank account, and deposit, with all the rest of the documents needed for your one year extension. It sounds like currently you are on a 60 day visiting family visa, not a marriage visa extension. Also, if you were not married in Thailand, you will need to get your marriage license officially translated into Thai. Immigration will give you all the details. Right after you get out of quarantine open a bank account in your name, and deposit at least bt400,000 in it. Do these two things as soon as you get out of quarantine, and take your wife with you to do both. Thai banks have tightened up on who they will open new accounts for, if you don't have a work permit, so you'll have to try different ones.

You’ll need to have a bank account in your name only and transfer funds over. 400k for a marriage extension or 800k for a retirement extension. Both need to be seasoned for 2 months prior to applying. The 400k usually is needed to be kept in for 1 month after ( the under consideration period) the 800k for 3 months after and balance can’t go below 400k for the rest of the year