I travelled to the land of the non muslim for studies out of ignorance of the rulings. halfway into the studies, Allah guided me to the path of the salaf, but I am in my last year of the uni, am I still sinful if I complete my degree. I do not pay any usury.

If there is no danger to your religion and you are able to stay away from that which is forbidden—and I do not know your case, but some of the brothers are already married and they keep to themselves and so on—then finish your degree. Finish your degree and then you can do Hijrah, inshallah, or return to your Muslim country, bi-idhnillah, Azza wa Jall.