I never hit my goal weight either, and I've regained since then. Not sure how much: I'm afraid to look at the scale. I hope it's only 15, but I think it might be closer to 25 or 30. I've gotten addicted to processed carbs again, so I need to go off them, but it's tough.
I was near perfect on my diet for a year, but never did any exercise. I think that really prevented me from reaching my goal. I'm feeting very motivated to exercise now; in fact, I'm going tomorrow to get a gym membership. (I do much better at exercise with a gym membership than working out at home.)
I'd like to do keto because it's so effective, but since the surgery, my body really does not like it when I eat much fat. Also, there aren't a lot of protein sources I like, so I'm thinking about looking into a more plant based diet. I like the idea of fruits, vegetables, beans, string cheese, Greek yogurt, eggs, and some meat here and there. I should go back to protein shakes, but I drank so many for so long that I'm really tired of them. I think I'll start the Pound of Cure diet and see where it takes me.
Anyway, good luck to you! It's tough when it seems that everyone else has been so successful, but tomorrow is another chance at success.