mpolyglottos

It all depends on the person.
I have been strict carnivore since May of '24 and I have yet to feel the 'clarity' others talk about. Maybe the closest thing for me is that when I wake up in the morning (or even in the middle of the night) I am awake. I am ready to go, no dragging out of bed, sluggish nor slow. Eyes open and feet hit the floor. That is about as close as I have gotten to a mental change.
I am not sure about the keto bliss. I do feel better than I ever did between being off medications for an auto-immune disease, the weight loss and the shift in daily energy. I don't have like crazy made energy from carnivore, but it is more steady and feels readily available throughout the day.
I do longer fasts myself, anywhere between 72 and 96 hours once per month. I did do a 7 day stretch a couple of months ago. I do find a lot more energy while fasting than when eating.
Hope you can find the path that helps and allows you to sustain.
Scott