Go to a TDEE calculator and figure out what your BMR is. That is basically the calories you can eat and stay the same weight. Anything below that should result in a loss.
Don't cut too low or you'll end up feeling crap, get sick of being hungry and bingeing.
I'm 5ft 8 and can lose weight eating 1600 calories a day so you don't have to eat a starvation diet.
Then look at what you eat now and could easily give up without missing it, things like full sugar coke, lots of teas with sugar....
Then work out what you can't see yourself completely cutting out and give yourself a 'ration'or an alternative. If you love chocolate for example would options hot chocolate meet the need? Instead of spaghetti or in addition to spaghetti could you have half a portion and top up with green beans in your plate. Less calories, same amount of food, more nutrients.
Full fat, high protein will fill you up for longer and make your body process glucose better so you feel less hungry. Low fat, high sugar is a false economy, technically less calories but you'll be hungry sooner and end up eating more.
I have lost lots of weight in the past using the above methods, didn't stick to it ultimately and regained some and now I have diabetes and have ended up on Mounjaro for glucose control which does make it easier to reduce calories.
Dieting is hard and it's a long game, if you have multiple stones to lose then you realistically are looking at multiple months to lose it, so make a plan you can stick to until this time next year.