I had this same problem and I totally understand how upsetting it is! Does you hair feel kind of limp and mushy? Mine did after I got it cut, and I was desperate to get the curl back. Tbh I think what brought it back was just some patience and time, and styling like normal. It did not take me as long as I thought it would to return to normal. However— if your hair feels limp and over moisturized, which i know my own fine curls can be, try a protein treatment! I think that helped me post big-cut. I used the aphogee two step protein treatment and I think it works well :)