It depends on your perspective. Some might think so, while others might have doubts based on various factors like the hero's actions and character development.
The manhwa 'A Broken Hero' tells the tale of a once powerful hero who has fallen from grace. He has to overcome inner demons and external obstacles to reclaim his heroic status. The story is full of action, drama, and self-discovery.
The 'zero to hero light novel' might tell the story of an underdog. It could start with the main character being an outcast or a nobody in their society. As the story progresses, they might encounter a mentor or a special opportunity that sets them on the path to heroism. This could include learning magic, combat skills, or strategic thinking. There might be a grand quest they have to undertake, and along the way, they have to overcome their own insecurities and limitations to become the hero that their world needs.
The light novel 'Re:Zero - Starting Life in Another World' also fits this. Subaru is a normal boy who is suddenly thrown into a fantasy world. At first, he is completely out of his depth, but through countless deaths and resurrections, he learns, grows, and slowly becomes a hero - like figure who can save others. His journey from being a zero in this new world to a hero is full of hardships and character development.