First of all, don't weigh yourself more than once a week. There are natural fluctuations related to water retention and hormonal balance. If you are a woman, you will notice these fluctuations more often. If you see no movement on the scales or even if your weight goes up, it doesn't mean you are not losing fat. If you exercise, you may even see a little increase in weight, as muscles are heavier than fat. The important thing here is to concentrate on losing body fat. Don’t rely just on scales, use body tape, calipers, belts or clothes to see any changes.
I have never tried a keto diet (don’t like the idea myself) but I am what you could call moderately (or “liberal”) low carb. Around 125g max net per day, which as you likely know is half the RDA of 250g. I get most of the rest of my energy from protein and some for fat. The RDA of protein, around 50g, is only just enough to sustain muscle of a sedentary or low movement individual – and this is proven by the fact that a lot of people who hit the gym eat easily 2-3x the RDA of protein.