There are several synonyms you can use instead of the phrase "step out of". One common alternative is "exit", which means to leave a place or situation. Another synonym is "abandon", which implies that someone is leaving behind something or someone they were previously involved with. "Vacate" can also be used to mean leaving a place or situation. "Withdraw" is another synonym that can be used to mean removing oneself from a situation or relationship. Lastly, "disengage" can be used to mean stepping away from a situation or relationship, either physically or emotionally.