I have reservations about the carnivore diet, partly because it looks boring AF eating nothing but meat and eggs all the time and because the adherents (Carnies) as about as annoyingly cultish as Crossfitters and the Fasters.

And yes not everyone thrives on the same diets, I know of bodybuilders who got big on high carb diets and some on low fat diets even and not a single one who got there by fasting but the one thing that's universal is getting at minimum 0.8g of protein per 1lb of bodyweight. There was one who got ripped on carnivore but ultimately had to put some carbs back into his diet as he got to a point where he just couldn't progress and perform well on just protein and fat alone.

Personally my diet is high protein and high in sat fat with moderate carbs (about 50% of "normal"), sugar intake is about half of what is recommended and importantly trying to keep fiber fairly high as low-fiber is one of the root of many problems in the western diet. So many issues can be addressed by raising your protein and fiber intakes. One thing I noticed by minimizing my consumption of seed oils is that I went this entire year not getting sunburned once despite not using sunscreen, it's theorized that polyunsaturated oils building up in the skin are the cause as they oxidize the most easily under UV light.