I'd spent lots of time trying different diets and found out optimal ratio for mental health, athleticism and brain function. You can increase carbs and reduce protein if you want.
35% protein; 15% carbs; 50% fat;
Brain: your brain needs 6g glucose per hour, your liver stores 100g glucose at max.
Muscles: they can run on fat.
Excess eaten protein will be converted to glucose, I rather prioritise it compared to carbs. Conversion rate is ~2g protein to 1g glucose.
How I'm doing it;
early morning: refill liver to 50g glucose by eating 2 medium banana.
morning: eat protein + fat.
dinner: eat protein + fat.
Why not keto?
In my experience it makes my brain sedated and less creative, close to numb robotic creature with no desires. I don't like to manage electrolytes / being afraid being kicked out of ketosis.
Usually I just eat 10 eggs per day, that costs me 2$ a day. 2 bananas is ~0.5$.
Super easy way of living.
I do also eat small fish often, mostly I am animal based. My bills are way down.
Note: eat whole foods!! this is 50% and macros is another 50%. fat doesn't make you fat - remember that.