If you don't qualify for LTR and you don't have enough money for Elite visa, the option left is a working visa. You can use a company to sponsor you for a working visa. Iglu is an example, but there are more.
Thank you so much for all your recommendations.finally I got the 60 days visa extension in Samui. Quite easy, didn't need TM30, only 1900 bahts and few copies and passport photo. Many people and took 4 hours (went at 9am, maybe because hokidyas of last week).
They don't ask for questions or this kind of things. So if any want the extension, here in Samui is pretty easy.