1. Eliminating liquid calories and substitute sweeteners. Once I figured out that substitute sweeteners made me crave genuine sugars I got rid of them which made it easier to get rid of all liquid calories. Other than one or two servings of alcohol a month in social settings and an espresso in the morning I've had nothing but water to drink for a couple of years. It's made a huge difference in the way I feel.
2. I got rid of "direct" sugars. No ice cream, desserts, other sweets. I don't worry about carbs (bread, pasta, etc) being converted to sugar.
3. As a general rule I'm not hungry until noonish. If I forced myself to eat breakfast it triggered something and I ended up being hungry all day no matter how much I ate. I've decided the 3 square meals a day thing doesn't work for me. I switched to eating on an unstructured schedule, mostly salty snacks (chips, jerky, cheese, etc) during the day with a protein heavy meal at the end of the day.
About a month after I had ^^^ figured out I started feeling much more energized which meant I was able to do a lot more walking. I live in a city, 90% of everywhere I need to be on a regular basis is within a dozen blocks. Where a couple of years ago I might have driven 4 blocks now I walk everywhere.