You don’t actually need to measure anything. Or maybe it’s good for you in your individual case, why knows but it’s not required on keto, many people enjoy they don’t need that.
I don’t have targets or limits at all. My fat wildly varies on keto and it’s fine. I am curious and like data and sometimes it’s even helpful so I track, I just don’t limit or try to reach numbers (protein will be high anyway and carbs low enough, carnivore is especially good at that and I do that now).
I eat the food I like. I am lucky as it gives me good numbers, I rarely eat more than twice as much protein as I probably need… But many of us handle high protein well. Mine isn’t insanely high, I would hate that waste and potential problems, just somewhat more than my need, many people have this.
How to measure fat? Well, I eat fatty protein. I can’t measure it. I guess something and it must be somewhat close to reality but what if it’s off a bit? Nothing happens. Even you have target macros, they are a bit random, not your Specific Needs, you don’t know those and those are ranges anyway, not single fixed numbers. There is a big wriggle room.
Even if you aren’t a savage like me who ate between 54 and 254g fat on keto days while thinking them just fine days (my way fewer carnivore days were more like 80-160g). Even my quite typical days aren’t very similar macro wise and of course not, I am no robot and bad with eating the same every day. Very, very bad.
How to achieve a higher fat/protein ratio… Well, you do one aproach: lots of (?) added fat.
I avoid added fats for reasons so I need quite fatty protein sources even for my usual 65% fat. I refuse eating much fattier than that now but I will need to add fattier things when I will eat much more. But not everyone can eat super fatty right away especially without carbs. If more protein is way more comfortable and you feel right, do that and if you disagree with high-protein, train yourself to be happy with fattier meat or something (I train myself slowly in the cases when a sudden change feels bad so it’s unrealistic).
There are tricks. Eggs are fatty but still feel not so fatty so I can eat fattier meats with them than alone. Boiled eggs with some super fatty meat or some fatty sauce, scrambled eggs with fatty meat…
If I want to add fat, it’s easiest to eat cream or sour cream (beware, lactose).
But there are zillion options, probably several ones for most of us, almost no matter how choosy or restricted our eating is. A fat-hating lean meat lover probably has it very hard, let’s hope they never need keto or able to change. Oh yeah, we can change A LOT. Sometimes surprisingly quickly. I experienced it.
Some (probably many) ketoers bring their carbs with carbs and low-fat mindset into their keto, it’s very strange to see their menu… You are already way better
Most of us aren’t so good in the beginning but with some determined effort, we can make it work.
Btw I have no idea about portions. I don’t even believe in them. I easily sit down and eat 130g fat and it’s all good.