I am the last one who should say this, but please do not expect increased weight loss speed from walk/jog/run. The problem is your legs. Your legs need min. 8-12 weeks to be ready to run 30 min. Much more to run 60 min. During these weeks your body adapts to run, becomes more efficient, running on less fuel. I ran 25 miles/week with 90 min long runs last summer, still losing the last 10 lbs took more than 3 months.
Running is wonderful, has many advantages - advantages you can not measure with a scale:-))) For example it is excellent way to "tone" your legs, butts.

It is widely recommended to change your exercise routine in every 6-8 weeks. How about step by step incorporating some other type of cardio or weight training?

There were a couple of threads for people who had less than 10lbs, 5 lbs to lose - it seems there is no miracle cure: simply be patient:-)))
Congratulations to your weight loss:-)

Eva