Hug's
I hope you are at a healthy BMI and not underweight. 13 months out, It must be hard to go into maintenance diet when you have an aversion to meat. Food can be a challenge. Have you tried any bariatric recipes to mix things up? Are you drinking shakes to get Protein in?
Links to the vegan bariatric forum and the maintenance thread below. It may help with food ideas and to stop weight loss,
https://www.bariatricpal.com/forum/1101-vegetarian-or-vegan-eating/
https://www.bariatricpal.com/topic/425802-the-maintenance-thread/?tab=comments#comment-4782396