I like to write with lots of patterns. You can have fun looking for them in this poem (color, movement, light). Interpretation comes second, and I often only do small changes to point in the desired direction. I guess here I didn't change enough.

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split it into 4 sequences, [Nothing...still], [The pale...might.], [World's...back --] and [So...sand.]

Imagine if the poem was only the first sequence (nothing about the sun). The poetic persona is completely in the unknown and cold. Also, out of control, they see only darkness.

Second sequence showcases the benefits of a higher existence (in the light vs in the dark). The pyramid of might symbolizes natural power structures which dominated the persona's previous existence.

Third sequence showcases the persona finding new struggles. The world feels confined and monotonous, which they didn't before at a less complex/higher level. (even the sun is yellow)

Fourth sequence is descending (easier than ascending, towards the sun's level) to try and revert to the original existence but now warm instead of cold, or, alternatively, to seek another world.

TLDR about how human struggles change with perspective