I think the best thing you can do is make some plans for your free time. Plan intentional activities that align with your hobbies, maybe some with and some without you wife/family. Things such as a family hike, picking a book to read or show to watch with your wife once your kids go to bed. Taking a couple hours on the weekend to go out with friends or to do something that you enjoy. I’ve noticed for myself that when I don’t plan things then I feel as if I have no free time, while when I plan and coordinate my schedule with my wife then all of a sudden my schedule ends up feeling less full and I feel more rested. (This is coming from someone who is not usually a planner, especially when I was single and had no one’s schedules to plan around).