How can I change my exemption visa to a Non-O visa for a guardian visa in Thailand?

The user inquires about changing their exemption visa to a guardian visa but learns from the immigration office that a Non-O visa is required first. Since they are not married to a Thai citizen and are under 50 years old, they seek advice on how to make this change. Community comments clarify that obtaining a Non-O visa is necessary for a guardian visa, and although requirements may vary by location (like in Phuket), transitioning from an exemption visa to a Non-O can be complicated.