Earlier quoted context omitted.
I am not so sure. In my case, my wife is the "messy" one: Opens a can and leaves the lid in the kitchen table, leaves used clothes all around the bedroom and bathroom, etc. We've been married for 14 years, and the first years it was a constant struggle for me to try to change her behaviour. We even have gotten to the point of raising the divorce card in discussions related to this. But, fast forward to today, I learn…
Sorry to be solutioning here, and I'd imagine you've already tried this after 14 years, but sometimes changing habits can be solved with things like buying an extra laundry basket. It's seems like a small thing, but these adjustments can provide the accessibility that make it simpler to meet in the middle. In the kitchen, we keep a mini-waste bin on our countertop for used coffee grinds. It works for us.
Trash accumulating somewhere? That spot needs a trash can.
Clothes? That spot needs a hamper/basket.
Spot in the yard keeps getting messed up due to walking or cars going off the driveway there? Put down some stone.
Behavior modification (for some sorts of things, anyway) should be a last resort because it probably won't work, and requires ongoing effort. Fix the environment, and it's done.