Here is a tip that I use pretty routinely to help me curb my greed and to eat less food.
Whether it is ice cream or a tasty entree, I will routinely offer the last two bites (at least) to my dogs or, if they aren’t available, the trash can/garbage disposal. There is something very helpful to me in not acting like I am entitled to everything on my plate, even if the helping is smaller by far than portions in the past.
So, if you have a dog or two (and your vet approves :-)) you might consider offering the last bite(s) of your meal to him/her each time you eat. It really makes a difference for me. Even if I am not at a 5 yet, it helps me to just will myself to let go of those bites.
The dogs love it, too, of course!