"Rest easier" is a common phrase used to express someone's relief after a stressful situation. However, it can be helpful to have alternative phrases to avoid repetitiveness in communication. Some synonyms for "rest easier" include "breathe easier," "feel calmer," "be at peace," "relax a bit," and "let go of tension." These phrases can provide more variety in communication and convey a sense of reassurance to the listener. Additionally, alternative phrases can help to avoid the use of cliches and make communication more personal and authentic. Overall, having a range of synonyms for "rest easier" can improve the quality of communication and help build stronger relationships.