I am 165cm (5'5") and back in March I was about 260lb so in the same sort of range as @pepsicolagirl. I am now 192lb so still a bit heavier than you @Overwhelmed10 but still heading steadily downwards.
I totally agree with you @pepsicolagirl that being told to ELMM is a stupid piece of "advice" and anyone who tells you it deserves to be shot for the patronising attitude. That's not advice. The question is How because it is really difficult to get onto this path.
For me, the key to being able to eat less had 2 main strategies both of which were massively helped by lockdown and being furloughed.
Firstly, trying to develop positive emotional responses to the sensation of feeling a little peckish and choosing not to eat - thinking of that as the sensation of getting healthier, so feeling proud and valiant through it. Evolutionarily we are adapted to start feeling a little peckish long before we really need to eat, in order to give us the drive to go out hunting or gathering that could take a few hours to yield the food for a meal. If in a situation of affluence we sate that sensation immediately with a snack, we are over-eating.
I have had huge food issues in the past and get extremely stressed and upset (literally to the point of wanting to self-harm to relieve the mental pressure, very screwed up) in situations where I am hungry and can't eat (especially when staying with my parents as my mum would cook tiny portions and there would be no other food available for topping up if still hungry) and I associate feeling hungry with being punished, inadequate, and unloved and eating high calorie food with being valued and rewarded. Thanks mum. But I have been working on separating out "hungry" from "a bit peckish" and learned to tolerate the latter. Until I did this, I spent years where I was pretty much always "feeling full" and that was way more food than I needed.
The second strategy was to gradually reduce my body's food expectations over the course of a few weeks by only eating tiny portions, very much not a full meal's worth, but then eating again initially 2 hours later. So right at the start it might be just a small banana at 8am, but then some fry-light sauted mushrooms on a ryvita at 10am, and a mini-wrap with salad at 12noon, etc etc each item being only a few mouthfuls (tiny side-plates from Ikea helped with portion control) and has high veg content to ensure it is filling. This stage does take a lot of time, which is why lockdown and furlough really helped. So you never feel really full, but you are also never really really hungry and you never have very long to wait till you can next eat. You do not stay at this stage for long - it wouldn't be good for you (it's the complete opposite to the "fasting" strategy that others advocate). Once you are used to only eating a few mouthfuls at a time, you can gradually start to stretch out the time between eating times - move to 2h15m, then 2.5h, gradually gradually working up. With small changes, you might then up the size of the meal a little to make sure it can keep you feeling fuller for longer when the gaps between eating have stretched sufficiently, but you can get to the point then feeling OK with eating 3 times a day and feeling satisfied with those 3 times adding up to only 1200 calories or whatever target intake you decide to go for.
The other thing furlough helped with is that whenever I felt like a snack and it was still an hour before I could next eat, I went for a walk.
I'm very lucky that I had the time and space to do all this, and I am really happy that my BMI isn't in the "Covid high risk" category any more.
Good luck to you. I hope my experience is helpful to you.