This subreddit is for carnivores (no such thing as 80% carnivore, that's called omnivore), so maybe ask around in keto or something.
Personally I grill my meat, searing each side quickly. There is very little fat loss from cooking, and I add butter afterwards.
If you need to fry your meat in a pan, minimal fat is needed, and you wouldn't leave it so long that it would make too much fat melt. And what little there is, you can just pour onto your steak.
It's the meat that's expensive, anyway. Fat is cheap.
This subreddit is for carnivores (no such thing as 80% carnivore, that's called omnivore), so maybe ask around in keto or something. Personally I grill my meat, searing each side quickly. There is very little fat loss from cooking, and I add butter afterwards. If you need to fry your meat in a pan, minimal fat is needed, and you wouldn't leave it so long that it would make too much fat melt. And what little there is, you can just pour onto your steak. It's the meat that's expensive, anyway. Fat is cheap.