I think you need to end your current visa. Then apply for a new one. So research how to end your current visa, re enter under a visa exemption and apply for retirement. Let’s see what others way more knowledgeable say? I am following for the knowledge?
biggest one, “what did change last year was that all monies remitted to Thailand are now accessible”. Not all monies brought in is accessible depending on your DTA! You were correct about the new rule about hiding money for a year if it falls under accessible. The Thai tax website is great and it explains it clearly in easy to understand English. Also has a link to DTA’s.