How can I change from an OA visa to an O visa based on retirement in Thailand?

The process of changing from an OA visa to an O visa in Thailand involves a few steps. Some expats have shared their experiences, noting that it's generally a straightforward process if all necessary documents are in order. You can either leave the country and apply for a 90-day Non-O visa at a nearby Thai consulate or enter with a visa-exempt entry and then convert to a Non-O visa at an immigration office, though not all offices offer this service. Key requirements include having 800,000 baht in a Thai bank account, which should be documented as transferred from abroad, and proving financial income of 65,000 baht per month for the O visa. Additionally, there are opinions and insights shared about qualifying medical insurance policies and the nuances of bank account regulations.