My O-A Visa, issued at Thai Consulate in Los Angeles expires in a few months. I'm heading back to California mid March and will stamp back in a few days before the O-A visa expires and get an "Admitted Until" date of 2021. Can I still buy a re-entry visa during this time if I want visit another Country, or should I start making steps towards extending my O-A or converting over to an O? Appreciate any help or suggestions. TIA