Which areas you lose fat easily and which areas are more stubborn is genetic. Nothing will change that. There is no such thing as spot reducing fat.
There is some evidence that fasting can help reduce loose skin slightly faster than otherwise. For this you want prolonged fasting, not intermittent. Between 24-72 hours with regular intervals.
If you really don’t want to lose more fat overall, but want some local fat gone, your only option is really liposuction. However, a lot can be done to change the overall body shape and appearance by building muscle.