weight loss

hi guys:) has anyone managed to lose weight with otf? so I started dieting 3 months ago and started otf 1 month ago. I EASILY went from 180 to 155 pounds in the first 2 months where i was dieting only and literally not moving my ass at all. i've been going to OTF everyday for a month now and my weight has plateaued. I still eat in a calorie deficit and count my calories everyday and weigh everything i eat any insight? thank you (for reference i am 5'3)

edit: i'm already working with a dietitian :) thanks everyone for the insight