If he continues to study he will have a better probability of finding a good job. Tell him that you are their for the hole way and he needs some one to believe in him or he will feel alone in his studies.
If this question was more about persuading then list the opportunity he may have if he does study which would be finding a good job and being more knowledgeable. Inspire him would help him and it is part of persuasive theories to tell him he is not alone.
But since this about Hanna then tell him the ways it will help both of you. You will also be able to provide in this relationship ( that apparently she was forced into because she didn’t agree). If that didn’t work move to a new country then file for divorce.....
I can’t really help when it is more about her trying to persuade him to let her go but tell him you can offer help to.
It’s not just a mans job and that the smarter you are the more real-liable your could be....