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This argument is wrong. The actions we do affect reality but there is no evidence that proves that they create a new reality. The many-worlds interpretation of quantum mechanics states that every possible outcome of a QUANTUM phenomenon is happening but in separate universes.
Although our actions do not create new realities literally, they do transform our reality, thus making it different from what it was, becoming new.
The assumption that our decisions ALTER reality is a bias of cognition - we like to think our free will is strong. However, it is more accurate (if less comforting) to acknowledge that our actions are a product of our reality.
Just as a reality greatly impacts an individual's action, the individual has complete agency to commit any actions; of which will have certain consequences and radiating influences, thereby creating new realities that stem from decisions.