Are you getting enough fat? If you fill up on egg yolk, bone marrow or butter you should be pretty satiated

What are you snacking on? If you're hungry maybe you needed a bigger meal (or a second meal) rather than whatever snack item

Be careful with dairy if that's in your version of carnivore - I find that I can be full to the point that I don't want to eat almost any food you'd put in front of me, but I could often still down a pint of cream (which is especially risky as I can rationalize it as animal fat, see point 1)