What happens if my Non-B visa extension expires on August 28th and can I apply for a new visa before September 26th?

The user's Non-B visa extension expires on August 28th, and they are concerned about their options before the amnesty deadline of September 26th. The comments clarify that the user will be in overstay if they do not take action by August 28th, though the amnesty allows them to leave before September 26th without penalty. However, failing to cancel their extension might complicate future visa applications. Additionally, they cannot convert their status from overstay to a new visa while still in Thailand.