Just go back to keto. You should get into ketosis very quickly, nothing special is needed. Fast if that is what your body desire and feels best but don’t force it. I don’t get this “fast after carbs” thing people are so much into, my body definitely hates when it wants food and it doesn’t get it (oh it always gets it, it can be super stubborn and revengeful about it
and I am not a masochist).
I never would call it cheat, I merely go off keto, very regularly. Maybe one day I evolve - and there is winter where I can avoid eating fruits all the time, I actually can stick to even carnivore for weeks…