Top Fast Weight Loss Information

I lost 15lbs over the course of the last 3 months averagin 1-1 1/2 lbs lost. I am 5′5″ and I am now down to 142 lbs. I still want to lose another 15 lbs (is this okay?).
I have tried eating whatever I want to jumpstart my weight loss but that did not work. Currently I am on a semi-low-carb diet. I have to have some carbs because I get too dizzy. I also work out 3-4 times a week. Cardio for 1/2 hr and then strenghening exercises.
How can I get past this weight loss?
The scale hasn’t budged from 142lbs in 3 weeks.

Monique