When you're feeling low on energy or motivation, it can be challenging to find the right words to express how you feel. That's why it's helpful to have a variety of synonyms for the phrase "run out of gas/steam" at your disposal. Some possible options include "hit a wall," "lose momentum," "run out of steam," "sputter out," "lose traction," "hit a snag," "stall out," "bottom out," "hit a slump," "flounder," "wilt," and "fade away." Whatever synonym you choose, make sure it accurately conveys your feelings and helps you communicate your needs effectively.