Welcome!
What did you do differently when you used to be 121lbs? Is there any way you can incorporate those things back into your life? For example, I used to be 175, and went up to 212. I thought that since I used to work office hours, and go for an hour's walk every lunchtime, and I used to eat smaller portions and snack less, re-incorporating those things would be a good place to start.
I've lost 23lbs in 4.5 months. Nowhere near as fast as I'd like, but hey... Those 4.5 months were going to pass anyway, and weirdly enough, if I don't over think it and get stressed out, cutting out loads of foods and constantly analysing my behaviour, my weight loss actually speeds up. It's not an exact science by any means!
I really hope it works out well for you
Do post wherever you feel comfortable, I can't explain how helpful it is