So my story revolves around Earth fighting for it's freedom from an alien empire. My MC links up with the resistance and does his part in the war. In the end he plays a crucial role in the final battle that gains Earth her freedom, but it cost him dearly. And that's the jist of it. How exactly to present it is where I'm struggling. I can't seem to convey the sense that Earth has become an alien world and that humans are scarce on their own homeworld. The atmosphere doesn't say "The entire Earth is decimated by the war". Also, I'm falling short on obstacles for my MC and his crew to overcome and those I do have don't feel realistic to me. Happy to hear any and all suggestions!