Flat tummy !?

Zdg

Anything you guys can recommend to shape waist and make tummy a little flat or firm?? I’m not looking for a model body, I have lost a lot of weight and I have to use belts all the time so my waist is regaining shape but my lower belly like the pelvic area is giggly and is more visible cause of the belt (I use mid/high rise jeans) any recommendations??? Thanks