My weight loss progressively slowed down each month post-op. Over time, I needed more calories to be satiated. Finally, at 9 months post-op, the weight loss stopped right at my Ideal Body Weight. I'm currently 14 mo post-op, and I'm still experimenting with how much and what to eat to maintain.
I currently eat about 1800-2000 calories a day. I don't follow a specific diet now, but I try to stay focused on protein, eating clean, limited (and healthy) snacking. My biggest challenge is grazing. My restriction makes it hard to eat actual meals, so I find myself eating "pieces" of food throughout the day... some cheese here, an apple there, a piece of ham, some greek yogurt, a protein bar, etc. It's working ok for now, but it's something I'm monitoring.
Initially, I was tracking everything I ate, but I don't do that now. I keep a running tab in my head, and I'm trying to get to the point that I can regulate intuitively. I weigh myself every morning. I've regained about a pound from my lowest weight.