As many have mentioned above, your weight loss plateau might be due to muscle gain. So, you might think about getting your body fat percentage tested, so that you have a baseline, and then checking back periodically to see if you've made gains (that is, losses in your body fat percentage). My wife recently found out that after 3 months of regular exercise, she has reduced her body fat percentage by 10 points, a fact that means a lot more in terms of fitness than her weight, which has gone down all that much. And it was very energizing and motivating for her!