Have you ever tried living with bare minimum money?
The MC might have been able to live more comfortably if he tried a different job.
He spent years trying to be a swordsman, thinking that he had some hidden talent and he would do better if he just persisted a little longer. It turns out he was right, but nothing was objectively indicating as such before a set of critical conditions were met.
This is similar to someone in the modern world who wants to be a mangaka but gets rejected by every editor. Even as he tries to self-publish on the net, he gets no recognition. So he keeps drawing, complains that nobody recognizes his hidden genius and gets no income. Even going to flip burgers would earn him something, but he doesn't want to do even that because he's an artist.
Sorry, but this is all on him.