I'm resonating with this a lot. The thing that helped me a lot was starting my day earlier. I am trying to move all my 'mandatory' tasks to the morning and try to set timeboxes for them, so that after work I have enough time to do other things and don't get distracted. For example, I searched for a 24h gym around my place and go every Monday, Wednesday and Friday before/at 6am for 1h (+10 minutes stretching). It's sometimes tough but that's why I leave enough time between workouts and skip the weekend so I can recover or catch up on sleep if needed. Then afterwards I have an hour for chores like cleaning, dishes, etc.
I also replaced my train commute with a bicycle for some extra health points (and post-work motivation. Full trains depressed and demotivated me)
Same as you, I do IF and try to eat my last meal at ~6pm and don't think about food until next days lunch.
Other things that helps me a lot with being more motivated is trying to leave the office while it's still bright outside. I want to leave earlier because I'm happier and at the same time have more time+motivation for other things.