To get to the top of the temple you will need to maximize the yellow bar/Strenght.
It will take 4.5 times to complete the game.
I completed it 3 times (Normal, Normal+, Hard+) plus eaten 113 silver tail lizards plus 12 times I killed 1st and 2nd giants (Normal+).
Once at the top of temple - find the fruit tree and eat one fruit from the tree.
Check the video:
Credits to PowerPyx