Do I need to renew my DTV visa after my Muay Thai course ends?

The consensus among community members is that you generally do not need to present current enrollment documentation for your DTV visa upon re-entering Thailand after your Muay Thai course has ended. It is believed that immigration does not actively check past enrollments unless there are changes or new requirements implemented. However, it may be prudent to have some proof of ongoing activity related to your visa, such as scheduling lessons, but showing an old enrollment letter is not considered necessary.