@jenikinz - I think Dr Berry is excellent and you won’t go far wrong if you follow his advice.
I think you’ve had some excellent advice in this thread and I agree with a lot of it.
Eat when hungry, stop when full. 900 calories is very low and ordinarily I’d be the first person to be anxious - but from what you’ve said, you’re not deliberately restricting.
I am a big advocate for listening to your body, so if you genuinely can’t eat any more, then just wait a little longer before eating your next meal. You don’t have to eat 3 meals a day, and you don’t have to eat every few hours. It’s no problem to eat one meal in 24 hours if that’s what your body wants.
Electrolyte balance is key to not feeling rough through adaptation. If you don’t have any symptoms of ‘keto flu’, then you might not need them. I manage mine by drinking salt water - sounds awful, but if I need electrolytes, salt water tastes amazing whilst plain water tastes insipid and weak. If I don’t need electrolytes, then salt water tastes salty and horrid.
Most of all, don’t overthink it in these early days. Find some foods you enjoy, look forward to your meals, and keep looking forward. Counter intuitively, I found that the more foods I restricted (I am also carnivore), the fewer cravings I had. Your mileage might vary, but if you struggle with desiring old ways of eating, that might be helpful to know.