I'm not a native English user as well. So, take what I said with a grain of salt.
The very first thing I notice is how unrefined the prose is.
A worldwide deafening earthquake shatters the ground splitting the earth, as a never-ending sandstorm raze the surface while lighting strikes down with such might it obliterate entire mountains, all of this cause just by the small movements of the last standing God which now sleeps through the eternity above the world itself, twisting and stretching himself across the entire realm as he waits patiently for the opportunity to continue his work...
This paragraph for example try to do to many things at once. It list disasters, explains what causes them, introduces a god and its situation, while giving hints of what its purpose. All in one sentence.
You have to split each parts, remove some parts or both.
Have a specific idea or purpose for each paragraph in mind to keep it from getting muddled like this.
While the scaled God of retribution awaits, a story develops inside the deeps of this merciless world. Boiling steam of acid which could easily melt any mortal spreads inside the caves, that are now the only refuge Mortals have. Endless screams and cries vibrate through the air originating even deeper into the earth and as we fall, we can feel distrust, terror, pain, hate spreading in the guts of this doomed world, but remarkably that's not the only thing we feel there is something... Not new but something rediscovered, a feeling that was brutally forced to lay dormant for many centuries leaving the mortals into a dark place, but now it has returned and with it the possibility of change.
Not only is the paragraph very unfocused, it is very opaque. Like, what are you trying to say here? Don't try to overdo your writing, in the effort to be mysterious, that we can't understand what we are reading.
Also, be sure that you are using the right words. I think you meant to say 'stream of acid' instead of 'steam of acid'.
A citadel stands while its people prepare for battle. A battle that would be the first step towards a better future has started, A battle to end the war against the Terror's Acolyte who wishes to prolong the era ruled by his master who is the Designer of terror itself, this war has raged on for decades now with no clear winner. The Homo Sapiens and the Homo lupus know respectively known as HOMNS and HOMUS fight ceaselessly always going forward enduring the uncountable losses, always standing up and deifying a reality which asks of them to live as cattle or fall on the eternal nightmare.
The citadel just pops out of nowhere.
And again, this paragraph is trying to do so many things at once.
And after getting here, I noticed that you wrote the story as if you are filming a movie. You show us a very wide view of the world with the disaster and the sleeping god, then zoom in into the depths of the earth, then zoom into the citadel where a battle happens. Don't do this. It is a visual technique that isn't going to translate into texts.
On this day Homns and Homus prepare to fight as they have done for centuries but this time it is different, be it by luck or just mutual benefit a bond long dead was revived as a long-forgotten family wish to join them once again, one who reached and offer their help in exchange of asylum. The 2 families had reasons to distrust the forgotten ones since the Homo Natura also known as HOMURA abandon them in the past, hiding and enclosing themselves betraying the other families causing the deaths of thousands and the subjugation of an entire family... But as the distrust, fear, and anger start to emerge, a Homus leader in her wisdom declared:
I don't get what is happening here!
"All the Homura in front of us are not to be blame or be punish by the sins and transgressions of their predecessors since the offspring are not their predecessors and above all can't choose their progenitors"
As these words were spoken every doubt, fear and resentment dissolved, changing to a warm welcome for their long-lost siblings. Now 1 week after it, the Acolyte has begun to move and when it was known that a new battle approached, the leader of the HOMURA stood up and pledge to live or die with the Homus and Homns.
Woah. Just a single sentence and all the resentments are gone?
And a time skip.
Seriously. The way you tell the story is inconsistent. There is the movie thing with the moving camera. Uncontrolled time skips and flashbacks. You even have a plural first person thing ( . . . as we fall, we can feel distrust, . . . ). Then you go on more fairy tale approach.
The narration is just a mess.
This needs a serious rewrite.
You also have to study and familiarize storytelling techniques. Study how people tell stories in this medium.