One suggestion is to try and flip your day. Don't expect to have energy after your solid day at the office to focus on smaller things at home.

Get up earlier and spend some time right away working on your smaller things requiring focus. I don't think your core work day would be robbed of anything either, a significant portion of the energy loss is the context switch from work to commute to home.

If you get up two hours earlier and go to work at the same time, the end of the day will feel a bit latter but i'd wager you'll be just as productive as the end of a day right now.

Note: Speaking from speculation, not experience.