If you are after money, I would stay where you are and get command + 500hrs on type then go to china. Just type “Viet” on avharald, and see how challenging it would be flying a narrow body in the region. You might end up in custody.
I flew in the middle east and it will certainly not so much of joy, but if I were to choose between Vietjet and the middle east, I would go to the latter.