You're doing fine, and 3 weeks is really too early to see much in terms of fat loss results. It is however, long enough to start seeing changes and feel better.

I know you say you love almond butter, and that's fine, but it can cause problems if it's not balanced out by higher fish - you can do that with actual fish, or fish oil, which you seem to be getting enough of. Nuts and seeds can stall fat loss, and can contain too much omega 6's - if you can find Macadamia nuts, use those, but they are pricey. (Obviously avoid peanuts as they're legumes, not nuts, but you probably know this already.) Some seeds can be problematic in terms of phytates, but in general they aren't going to be too big a deal.

Avocado is a good source of fats, as are butter, bacon, coconut oil, high quality extra virgin olive oil, so unless you're eating very small amounts of them, you don't have to worry about rabbit starvation. You can do something like bullet proof coffee if you want to get higher fat, but from the sounds of it, you're doing all the right things. Just take your time, and let it work its magic. (Bulletproof coffee is coconut oil + grassfed butter with hot coffee in a blender, and it tastes amazing.)

If you're eating raw carrots, I wouldn't worry too much about the carbs, it's hard to eat too many of them. If you eat them cooked, the fibers are gone/soft, so it's easier to get at the sugars, so then I'd limit them.

Alcohol is fine as long as it's not beer, which is made from grains. Distilled alcohols, even whiskey is fine since there's little possibility of gluten/gliadin making its way into the drink. So stick to spirits, and it'll be fine, but it will prevent fat loss, so go easy on the booze - also beware of what it's mixed in with (i.e. if it's some commercial flavored drink, it may have tons of fructose, or carbs and artificial flavors.)

BTW, the whole dairy and nightshades thing is temporary, not everyone has issues with these. Certainly dairy is questionable for some, I myself have issues with cow dairy, though I do fine on goat/sheep/buffalo dairy - but cow dairy almost instantly causes me acid reflux the night after eating it. Dairy in high amounts can cause fat gain because the whey is insulogenic, but in small amounts, it's not a problem.

Nightshades (and in some cases eggs) are a source of problems for some, nightshades causing things like arthritis, and eggs causing indigestion.

The idea is to do at least 30 days without those foods, then to reintroduce them slowly, one at a time, and see if there are any negative results, and if not, enjoy.

If you do eat too much protein than you actually need, it will be effectively the same as eating too many carbs as the excess will get converted. Typically, you'd calculate your ideal lean mass target weight, then eat 1 gram of protein (not meat!) per lbs of lean weight. Now meat is anywhere between 25%-33% protein, the rest is going to be mostly water, along with a bit of fat. So to size up portions, a chunk of meat the size of your palm at every meal, or multiply grams of protein by 3 or 4 to get at the protein.

There's this effect where if you eat higher fat, especially in the morning (which is why I mentioned bulletproof coffee earlier), it turns off your appetite. However, carbs, especially those containing fructose (you said you didn't eat fruit, so that's good) will cause you to get hungrier later on, but so will very lean meats to some degree.

Exercise will not cause much fat loss, but will signal muscle gain if it's resistance/weight lifting. Cardio however, will cause muscle loss and increased appetite, so careful with how you work out.

Ignore the scale, it's not going to tell you anything useful unless it's one of the ones that measures water, muscle, fat, bone levels, and even those are notoriously inaccurate.