What should I do to burn more calories than what I consume?

Hello. I've recently joined this site and discovered its wonderful resources. Iam 21, 5'7 and currently 90 KG.

I have found out that my daily consumption of food (1000 cal) is more than what I burn in exercise everyday, which is 700-800 calories (I take aerobic classes 4 days a week and Yoga 2 days) I cannot exercise vigorously for more than 1 hour because I have a ligament injury in my left foot, which has resulted in my ankle being weak. Due to this I cannot take part in high-impact aerobics, nor can I opt for skipping, jogging (for more than 5 minutes) as cardio exercise.

So I am confused at what to do. For the past 6 months I have reduced my calorie intake from 1500 daily to 700-800 (I have been struggling to lose weight for 3 years now, and have kept my calorie intake to 1500-1700). I managed to bring my weight down from 95KG to 90KG since February to August, this year, but I have reached a standstill in weight loss since August. I was advised to increase my food intake, as in Ramadan I was having 500 calories daily (still no weight loss despite exercising) So now I eat in a way that the gap in my small meals is 2-3 hours, instead of 6 hours. Right now, my target is to at least lose 2KG every month, but how do I do that when my calories consumed are more than what I burn? I am clueless on what needs to be done (should I eat less? should I exercise more?) so that I can lose weight consistently in small amounts to achieve my target weight.