The most important thing is for you to decide what your goals are. If your goal is to get leaner, then a huge amount of fat is going to be tricky. You can safely assume that nearly all of the fat you eat is stored as fat in your body. If you eat the fat in such a way that you get a lot of satiety and therefore eat fewer calories in general, then that can be a successful method of fat loss. It's really easy to overshoot that threshold and gain fat, especially with a mixed diet. Keep in mind that by weight about 20% of meat is protein and 20% of tubers are carbs, but butter is something like 85% fat by weight. So, not only is it more than twice the caloric density, but our fat sources tend to be more than 4x the macro density.
The reason this is important is that if you're making vegetables or mashed potatoes or something, you can make a ton of calories disappear into it by adding butter if you're not careful. Same goes for drinking a lot of coffee with heavy cream. A pint of cream has about 1600 calories. When you ingest fat, the chylomicrons send it to your adipocytes. Obviously those adipocytes are constantly in flux and are releasing the fat rapidly as well, but if you constantly flood them, you can have a net gain in body fat easily. A highly active primitive culture constantly exposed to the elements can make better use of the energy density in fat than relatively sedentary westerners. The take home point is that if someone tells you to eat a lot of fat and it causes you to gain weight or at least to not lose fat, it's not that you're cursed, it's that you've simply overshot the threshold.
In my personal experience the macro ratios that are most effective for fat loss tend to resemble those employed by bodybuilders when they're cutting. This is a group of people who are greatly invested in rapidly losing fat and thus they're really not going to do things that don't work, though they generally have, uh, exogenous assistance. Most of their strategies are lowish in carbs and fat and high in protein. It produces a lot of satiety without too many calories.
For me personally, after experimenting with a lot of different dietary compositions, the one that results in an ideal intersection point between feeling the best, losing the most fat, performing the best in my workouts etc. is about 100g of carbs from sweet potatoes (a bit more on workout days) a lot of eggs and meat and some fat here and there where it's appropriate.
What that ends up actually looking like is a 250g sweet potato for breakfast with a bit of butter, and as many eggs as I can fit in my stomach on top of that, usually about 3. Another sweet potato like that for lunch and as much lamb as I can eat on top of it. Then for dinner I mostly eat meat. Breakfast and lunch end up yielding about 5 hours of satiety and of course dinner takes me to breakfast the next day. The carbs just replete glycogen stores without interfering with fat oxidation and the protein is sufficient for repair and satiety. If you want to accelerate fat loss, find some resistance training that you enjoy doing and do it a few times a week. Additionally, walking as much as possible is really effective.