PB, I'm sorry to hear about the weight gain. But seriously: I bet you still look great. 20 lbs sounds like a lot, but it depends what weight you were to begin. I put on 20 lbs and I still look slim. I'm sure you're the same - we all saw that bikini body
I'm going to suggest something which you probably won't like. Why don't you eat the way that you ate to lose the weight initially? (I'm assuming that was still keto?) Idk - maybe being carnivorous doesn't suit you in terms of weight loss? Or did you start eating like that because you'd started to regain?
"I think the basic anti-aging diet is also the best diet for prevention and treatment of diabetes, scleroderma, and the various "connective tissue diseases." This would emphasize high protein, low unsaturated fats, low iron, and high antioxidant consumption, with a moderate or low starch consumption.
In practice, this means that a major part of the diet should be milk, cheese, eggs, shellfish, fruits and coconut oil, with vitamin E and salt as the safest supplements."
- Ray Peat