Not sore after class

I have recently started solidcore, trying to stick to 2-3x a week. The class absolutely destroys me and I feel exhausted for at least few hours after class but I don’t get sore at all. When I did a couple classes here and there, I remember not being able to laugh because I was so sore in my core but now it’s just nothing. I miss that feeling and have been wondering if I am doing something wrong. I try to amplify during the class to the point of absolute failure and don’t know what else to do. Am I doing something wrong?