No, it is not too late for you. After all, you'll be sleeved for life, foverer and ever. It's not as if your banana-shaped sleeve disappears into thin air after one year.
Here's the caveat...you are the only one who can conjure up the intrinsic motivation to get back on track and stay there.
Here's another reality: whatever method you utilize to get back on track will need to be the method you use to stay on track. An obesity physician once spoke wise words: "If you didn't like what you did in order to lose the weight, you won't like what you need to do to maintain the weight loss."
In other words, the habits you adopt while losing weight are some of the same ones you'll need to adhere to if you want to maintain the weight loss for life.