But I think thinking and courage are also very important to be a successful theoretical physics researcher. De Broglie of France was a rich boy when he was a child, and he was very interested in physics. His mathematical ability is mediocre among physicists at best, but he dares to think what others dare not think, or even dare to mention what others dare not mention, so he wrote a page in his doctoral thesis, published the material wave equation, and later won the Nobel Prize.
In fact, the most important thing is learning enthusiasm. As long as you like it, you will always feel that you have an internal driving force. Einstein studied in general when he was a child. The teacher thought that he could not achieve great things, but he was always passionate about physics. Although he was only a technician in the patent office, he studied physics in his spare time and finally published his special theory of relativity.