要温暖而鼓励地用英语表达“你好好发光”，你可以尝试以下几种说法：

  1. Keep shining brightly.
  2. Keep your light shining.
  3. Let your light shine.
  4. You’re shining so brightly.
  5. Keep on being your amazing self.
  6. Carry on glowing.
  7. Radiate with all your strength.
  8. Your brilliance is truly remarkable.

这些表达方式都能传达出一种支持和鼓舞的感觉，同时传达出对方有着积极的能量和特质。