Hello, maybe one reason you find it hard to stick to your diet is that you want to make a severe cut in your carbs(more than half!!)
If you eat now 300 g then try to make 270 for 1 week (that's a 120 calorie deficient alone) and then next week reduce by 10 g. It may seem so slow but it's better to make a deficient that you can sustain than one you cant.
Sled pulls are also great. You can also add more general physical activity like lots of walking...