How to Manage Contest Prep Brain Fog and Fatigue

I am four weeks out and the brain fog is starting to get real. I am finding it hard to focus at my job in Chicago and I am forgetting simple things like where I put my car keys. My calories are at an all time low and the cardio is definitely taking a toll on my central nervous system.

I have been using a supplement called Alpha GPC to help with the cognitive side of things but it only does so much. I am wondering if anyone has found specific ways to manage the mental fatigue without using more stimulants. I already drink plenty of black coffee and I do not want to ruin my sleep quality.

Is it worth adding a small amount of fats back in or should I just embrace the grind? I know this is part of the sport but I am struggling to stay productive during the day. Any advice from veteran competitors on how to survive the final stretch would be much appreciated.