No house, you own nothing in Thailand. You may not be lucky,

Go to the US embassy and see what she can do. in Bangkok

Bangkok Bank's home office is on Selom Road, and they can help you. I went there and then back to Ayutthaya, and they started with stupid questions, so I told them who to call. She did, and then she immediately got busy opening the account. That was years ago, and now I have three accounts with them. One account for the 800,000 Baht needed for visa. Another account for Direct deposit for US Social Security then the account for daily living,

Go to Bangkok Bank Silom Rd, Bangkok, and they have all the information you need. The nice lady who handles the retirement pay is very knowledgeable. I have 3 accounts with them. You must have 800,000 Baht in a Thai bank to get a retirement Visa? Agents will cover that but you have to pay extra for that. I have never used an agent and have had no problems. I keep more than enough money in the bank to satisfy immigration.

Call or visit the Thai immigration office and get answers.

You waited far too long. They do have telephones. // // It cost me B5000 to learn.

Did you ask Immigration?

Think before you do.

I was not married but we were together for over 25 years.

I understand your question. You and both need to go to a lawyer and have wills prepared for the future. I have done that and she died 2018. I live in her house but do not own the home or property. I can sell the house to a Thai, or will it to a Thai. You need a lawyer who has experience with this. All of you married to Thai should do the right thing.