500k for DTV Which you cannot work in Thailand with.
Maybe you find an online job first?
Nonb Visa supported by a school, but most schools requires a university degree.
You may get a job in a school in Isaan or something remote but would pay little. But at your age and experience level may be tough to find. You'd most likely end up with an agency for any chance.
So in summary, unless you have deep pockets and just want to travel and enjoy, it's probably not going to happen.