advice needed!!! Frustrated with plateau

Hello everyone!!

I have never used this so bare with me. I have been stuck on this weightloss plateau for almost a week now. My calorie intake is roughly 1500 net would be 800ish. I workout 6 days a week alternating my upper and lower body when I lift weights and I do 30 mins cardio intervals every day (elliptical) as well as abs. I have increased my cardio difficulty seems like every week just so my body doesn't get used to it. I also push myself during the intensity of the interval and "take a break" when the intensity is low. I am not really sure what I am doing wrong or what is going on. Any advice is helpful. I do switch up my weight lifting activities and lift for about an hour before I do cardio.