Clearly you are not studying Thai language.
To exit and reenter with permit is possible.
This question comes up when some folks with non Ed need to exit and reenter.
Normally for short periods such as couple of weeks.
Even then it's recommended that you have letter from school.
I agree with your agent.
See out current visa and then consider next move.
BTW find this statement weird.
"My personal stay history been here about 5 years on various visas ( like every kind you can obtain) I'm retired but under 50"
So here 5 years and this is your first post!!
Serious.
If here that long you would know answers to your post.