Ahhh...I have been in your place.
You lose a lot of weight, and then you slowly begin to stall 10, 20, or 30 pounds before you reach goal. It is the ole' "need more motivation" thing. You lose momentum, and have to do something to get it back.
I always found that making a goal for myself...sort of a mini contest, with a prize at the end. Do something fun for motivation, to get your exercise and calories back on track. I would find that I would "indulge" a little more here and there-not enough to gain, but enough to stop the losses. You know what I mean. Make a game. Put a dollar in a jar, or 50 cents, or whatever you can afford, for every day you stay 100% on track-or for each day you really get that workout in. Then, when you make a new milestone-such as losing another 10 pounds, or dropping another clothing size-take that money and buy something frivolous for yourself.
Sign up for something new-a karate class, a dance class, or a walkathon. Something to keep you motivated in your exercise.
After a while, the thrill of losing can go a bit...even if you still want to lose. You don't always keep that same drive like you have in the beginning.
This goes for maintainers as well, because if you are going to keep it off for life, then you have to find ways to continually motivate yourself.