Talking to you as an obese person.
Keto and atkins are a waste of time, totally unsustainable long term. Weight goes straight back on as soon as you eat carbs again. Took me a year to lose the weight I wanted, it was back on in 2 months. Plus I hated everything. It made me hate food and be so grumpy.
Same for VLCDs.
Weightloss injections - Again, when you stop doing them the weight goes back on, plus there are the added risks of increased chance of thyroid cancer and organ damage. Wouldn't suggest unless you're highly likely to die of something else first, like diabetes.
Eating less - Advice given by people who have never been obese. Our stomachs are bigger, can hold more, takes longer to be full. Our fat cells are bigger too, as they've been stretched, so weight goes on more easily and harder to lose.
A fat person who slims down to a "normal" weight will still have to eat 10% fewer calories than someone the same weight and height who has never been obese.
Intermittent fasting - Honestly it stopped my brain working, I couldn't think straight, couldn't function or do my job properly because I was being starved of energy. Even worse first thing in the morning until I was "allowed" to eat, at which point I was often unable to stop myself bingeing.
What's working for me currently is seeing a nutritionist and going back to basics. i knew I shouldn't be eating chocolate and diet coke for breakfast and having someone I had to report to really helped. I am also logging calories on myfitnesspal as it's so easy to go over or not realise the size/weight of your food.
I plan ahead, try to be more conscious about food, eat more regularly (so no "excuse" to get something naughty), only have healthy snacks at home, and drink/track my water intake. the weightloss is slower, but it feels much more sustainable.
when I'm thinking about eating something, I think "can I make a good decision right now" and usually the answer is yes. then I just do the same thing the next time. instead of thinking "I can't eat x" or "I'll never eat y again, how depressing"