When someone says "be/feel/look etc. yourself," they're encouraging you to be true to who you are. It's important to embrace your individuality and not try to be someone you're not, so finding synonyms for this phrase can be helpful. Instead of "be yourself," you could say "embrace your authentic self," "stay true to who you are," or "embrace your individuality." For "feel yourself," you could try "embrace your emotions," "trust your feelings," or "allow yourself to feel." Finally, for "look yourself," you might try "present your authentic self," "be comfortable in your own skin," or "own your unique style." No matter how you say it, being yourself is a crucial part of leading a fulfilling and happy life.