Maybe you can focus on something else other than weight. Are you stronger? More active? Feeling more positive in general? Remember that we're never really "done" because we want to be as healthy as we can for as long as possible, right? So try to think of your other recent milestones and give yourself a pat on the back. If that doesn't help, try making yourself a goal list or vision collage to inspire you and give you some ideas.
Hang in there!