I found the best success in calorie tracking and substitution of ingredients for lower calorie variants. Things like unsweeted almond milk instead of normal milk in coffee, artificial sweetners in stuff. Calorie tracking in the beginning was a huge shock and source of knowledge to me, I'd been eating healthier foods but way too much of them and was still gaining weight. You get a better idea of how much calories something is "worth" once you've tracked them. I am usually data driven about stuff so calorie tracking was the only way to put a number based set of data to something I never really understood.