This was a classic contradiction that often appeared in novels and movies. In real life, such a situation would not happen because it was impossible for a person to know a lot and not know anything at the same time. But we can use some tricks to overcome this problem. One possibility was for the protagonist to work hard on both aspects but not expect to completely change the world. For example, the protagonist could play an important role in the field he was familiar with but seek knowledge in the unfamiliar field to better understand the world. In this way, the protagonist can have enough ability and knowledge in the familiar field, but remain humble and cautious in the unfamiliar field without completely losing himself. Another possibility was to keep the protagonist balanced in both aspects. For example, the protagonist could play an important role in the field he was familiar with but maintain a moderate amount of attention and participation in the unfamiliar field. In this way, the protagonist could have enough ability and knowledge in the familiar field, but maintain balance and moderation in the unfamiliar field, and make a certain contribution to the world. Either way, we need to recognize that one person can't completely change the world. Everyone has their own role and limitations. Therefore, we should try our best to play our role within our own abilities, but also maintain humility and prudence to avoid falling into a state of confusion and overconfidence.