The phrase "changes gears" typically refers to a shift in direction, focus, or behavior. Antonyms for this phrase could include "stays the course," "maintains the status quo," or "sticks to the plan." These expressions suggest a commitment to consistency and stability rather than a willingness to adapt or evolve. Another antonym for "changes gears" might be "doubles down," indicating a determination to pursue a particular strategy or approach despite obstacles or challenges. Depending on the context, other antonyms could also include "reverses course," "abandons ship," or "throws in the towel." Ultimately, the choice of antonym will depend on the specific meaning and implications of the original phrase.