Come on
Starvation mode isn't a thing and never has been, as you lose weight your TDEE decreases ergo the amount you need to eat to maintain your body mass in number of calories decreases. Starving yourself does not defy the rules of thermodynamics.
OP, respectfully your food choices are garbage, high sugar, carbohydrate which will spike your insulin and drive the sweet evening craving you describe meaning you cheat on your diet.
The reason you're not losing weight is because you're not tracking properly.
Eating well doesn't take a lot of effort and I defy anyone who states they don't have time, make time. It takes 10-12 minutes to prepare some lean protein such as chicken or fish with steamed vegetables and some rice.
If you can plan a bank of 10-15 meals that you can calculate the calorific and macro content within a specific range to keep you in a calorie deficit it's pretty straight forward. Make multiples at a time so you have a quick meal to go the next day.
The key to losing weight is consistency, as others have stated exercise makes up a very small percentage of calories expenditure, it's all about diet.
Eat quality whole foods high in protein and you will feel satiated for longer. Ditch the mug shots and other crap, 1200 calories of real food IE not overly processed is often 2-3 times the volume physically of a similar quantity of calories of poor quality processed food such as mug shots and sweet treats.
100g of greek yoghurt with a few grams of honey and some fruit will set you back 200 calories and satisfy your sweet cravings.
People over complicate weight loss by following shitty fad diets such as slimming world which are nothing but marketing tools designed to keep you paying that weekly subscription forever. I don't know if anyone who has successfully lost weight with slimming world and kept the weight off forever.
It's a change of life style and proper nutritional education you need, not a fad diet that will teach you bad habits and help you develop an unhealthy relationship with food.
Also to those recommending GLP jabs, do one. I can't weight to see those that have abused these jabs in a few years time crawling for support from the NHS for their various heart and mother vital organs related issues. Mounjaro and the likes taken your calories so low that your body eats it's own muscles (your heart is a muscle) and will ruin your endocrine system through hormone imbalances. Save it for the morbidly obese and diabetics it's intended for.