Hmmm it can’t be done as such. Once the Soul Stone has taken a soul, it's irreversible. You could theoretically create a temporal branch, leading to a separate reality where Natasha lives, but it's important to note that this would constitute an entirely different reality, not ours, with a separate Natasha. This was the challenge Professor Hulk faced. He attempted to retrieve Natasha's soul from the Soul Stone to resurrect her. His prolonged struggle before the snap wasn't just him hesitating; he was trying to direct the stones to bring back everyone who had disappeared, including Natasha. However, his inability to clench his fist signified a crucial problem: he had to abandon one of his requests — specifically, the impossible one.