What am I doing wrong?

I have loss 20lbs in a month and now it's just stopped this week. I started September 2nd and was 20lbs down on Oct. 2nd. I'm eating well below my calorie budget like lower than 1000 cals and I'm working out excessively 6 days a week. I do cardio on the elliptical and treadmill for over an hour each.

I'm killing myself to get this weight off. I need to lose over 180lbs.

What more do I need to do? I hardly eat any carbs like less than 20g to be in ketosis and I'm getting lots of protein in.
What am I doing wrong?
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