this is really cool. the play on "writing on the wall", the old saying "if these walls could speak" or "if these walls had ears." the idea that walls stand in our way. a lot of cool conceptual playfulness and seriousness here.

In my opinion this is among the best you ever wrote. kudos........stan

Walls- the Berlin Wall, the great wall of China, Trump and his fucking moronic wall with Mexico, are strong images with much symbolism. I very much like the feel of the poem, and the narrative of events.
I would consider- the flow goes from questioning the walls hearing, to having writing in moss (most unique image!) to decay and collapse of the wall, regret in not having seen, or understood, the graffiti, and ending with the wall being reconstructed into a bridge that carries the "soul" of the wall, and finally your sadness in not having "heard the silent calls". I think it might be more coherent in you can connect the senses to the main idea of the poem, what the wall represents to you.
There is a lot of very good leads in the poem such as

side stepping
around some forlorn bricks
of fallen hopes
I moved on

But in the end for me the poem is a bit too abstract in presenting it's core idea to the reader. I think it needs to me more concrete (a pun!) Certainly "hearing the silent calls" presents some vagueness.

..

but 4 ur walls of fame
'tis bestest
me njois it