Try calorie cycling. Do some 1500 cal days and then some 2200 cal days to give yourself extra motivation and satiation. I think this is really good for sustainable caloric deficit The high calorie days are not “cheat days” just planned re-feeds.
Also, there is nothing unsafe about eating 1500 cal a day if you are over 100 pounds overweight. It can just be hard to sustain that kind of a calorie deficit and can make your body stressed out. That’s why I really like calorie cycling. If you bump your calories a few days a week it’s gonna make those 1500 cal days feel really easy. That’s what you want: easy sustainable weight loss.
Without knowing your age, your TDEE is around 2600. Cutting to 2100/day would result in a pound a week or so loss. Thats super sustainable, teaches you good eating habits and saves the want to binge from being overly hungry