The saying:
เปลี่ยนหน้ามือเป็นหลังมือ
bplíannᶠ naaᶠ muuᴹ bpennᴹ langᴿ muuᴹ
Is used to describe a total change in circumstances and means in English:
„to change from palm of the hand to the back of the hand“
It is used in the first person in the following manner:
„I changed from the palm of the hand to the back of the hand“
It means that my life changed completely or that I took a 180 degree turn. Think about it, if you roll your hand around, the look of it changes, the texture and even what you can do with it.
I mean, try grabbing a glass of water with the back of your hand!