I'm in no way qualified to offer advice here, but I've documented all the different eating plans I've tried over the years, and whether they have been effective for me short or long term.
In no particular order:
'Supplements'
Ayds, remember them? Chewy toffee sweets that suppressed the appetite. No effect.
Sugar free chewing gum or sugar free boiled sweets, to curb hunger pangs. No effect.
Tablets that contained chilli extract, to supposedly speed up the metabolism. No effect.
'Physical activity'
Gym. Joined for a year. Did swimming at lunchtime two or three times a week, alternating with step or aerobics. Used rowing machine, treadmill or cross trainer on other days. Took 2-3 rest days. End result, knackered and no weight loss. I would come back from the gym ravenous and eat loads.
Golf. Two to three times a week over summer. 14k steps every time. Stopped me putting weight on, but no losses. A partial success.
'Whole 30'
Lasted three weeks. Totally unsustainable. No dairy whatsoever. No carbs. No sugar. No processed foods in any form. No alcohol. No sugar substitutes (so no diet drinks). So boring. But you can lose up to 1lb a day. Until you stop, and it all goes straight back on.
'Weight Watchers'
Never tried. But I've heard stories about fat shaming in their groups.
'Calorie Counting / MFP App'
In principle it works, it's what all weight loss plans are based on. But it doesn't promote healthy eating. In theory, you could eat nothing but crisps and chocolate, and drink nothing but wine, as long as you were within your calorie allowance. Short term losses possible, but long term the weight will creep back on, unless you learn healthy eating habits and portion control.
'Mindful Eating / 16:8 / Fast800'
I just want cake and biscuits, I can't drool over a salad. No willpower. Doesn't work for me.
'Low Carbing'
Like Whole 30 but you can add cream and cheese. I love my carbs. Enough said.
'Slimming World'
Strip out the happy clappy nonsense and it's just sensible eating. The structure around red and green naturally limits your bad choices, but there's still enough room to enjoy a treat (syns) and you don't feel deprived. All food groups are allowed. Limited weighing and measuring. You are encouraged to cook from scratch. There's some motivational support in group, and (there should be) no judgement.
Losses can be impressive, if slow, but it takes a long term commitment in order for the losses to be sustainable. The flexibility of the plan makes that easier to do than many other weight loss systems. Definitely not a quick fix. It works, but you have to work for every pound lost.
I'd be interested to know of your experiences, and any other methods (and whether they've worked or not).