Yes, even if you came to Thailand with just a normal Tourist Visa (TR), you can change to a Retirement visa now:
https://www.baansmile.com/visas
We will help to to change to:
#1 "Non-O" visa
#2 "O-A Retirement visa"
Give us a call or add us on Line or WhatsApp to start talking now:
https://www.baansmile.com/visas