I have never lost my inspiration since I re-joined SW. I am as inspired as I was on day one.
My suggestion is to have a real think of why you joined SW and visualise yourself at the weight you want to be. Every time you want to eat junk, just think of yourself being slim. If you fall off the wagon, and stay off you won't be slim! Being slim feels a whole lot better than any taste of chocolate, or junk food, and the pleasure of food only lasts for minutes. Being slim lasts a lifetime, if you make right choices.
It's not difficult but you need to get your head right. I know, I have fallen off the wagon, and stayed off so many times in my life until I gave myself a good talking to. Now I find it easy to stay this way!
Good luck. You can do it