Did you try Shangri La? A set point problem can be helped by it. Also, depending on your age and your childbearing status it simply can be the case of the comfortable body at a comfortable fat level. The Why Women Need Fat is a disheartening read for the womanhood.
There are ways you can power through and drop the weight, drastic ones, but holding it down will be very hard.
You can look at the things like predominant fats and proteins in your diet, and do elimination attempts, working on various food groups and triggers, like sugar, fructose, starch, salt, dairy, legumes, O6, red meats to see if your satiation level can be changed o you are happy/healthy on less food.
You can also experiment with doing only low intensity activity for a few months to see if it gradually reduces appetite and prompts weight loss.