Register a business that has the word Thai or Thailand in the name. Create a website. Then go to an immigration attorney and retain them and follow their instructions. It can be done mate. But you will have to run a real business. The sooner you start the better. I would not approach an attorney and suggest they tell you what business to open. You’ll have to do the first steps.
Things change. Retired at 46 and move to better places…Thailand now - Colombia this winter. Don’t fixate on a permanent retirement…you’re giving up the best part.