Workplace management in general.
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Finish the day before you go to work. Don’t work until sleep, but do the dishes and all that, just like a workplace. Clean, tidy up and set the workplace up for the next day.
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Finish non-work related things before you begin: Exercise, family stuff, breakfast, cleaning etc.
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Respect your breaks and pay attention to when you need a break. Breaks based on the employees personal needs is a workplace with better cognition and stamina == reduced stress, mistakes, conflicts, sick leave and resentment.
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Pay attention to how you are by the end of the day. If you can be flexible, you might notice that some days of the week allow for more hours, while other days are more draining. External things we cannot control define that frame.
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Look into your time blocks of stamina. I can do 90 minutes and require few minutes to get into flow. After that, I’m melted and need a recharge break. For you it can mean very different timeframes. Respect how distractions ruin both the flow while working and the chances of flow if you distract yourself between flow sessions to avoid being bored.
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Batch all that boring practical stuff, like groceries, accounting, family planning etc. - Put a day or some hours aside and just batch everything. This relieves you of stress with these things hanging over you, and gives you a break from work. That break can prevent grinding fatigue and the meaning with your work being drained.
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Keep your job in a designated part of your home. Leave the job before you leave the area. Tidy up your workstation and prepare it for the next day. Change clothes, it has a psychological effect of relaxation. Treat this area as if it is geographically unavailable. It’s ok to say no to your boss unless there is an emergency. It’s also ok to say no to your friends and family while you work, unless there is an emergency or you promised something. As for young kids, vague promises give them leverage. Tell them you can do this and that after a certain time has passed, like the afternoon cartoon etc. - if you have no such precise timings, create a routine and then honor these promises at all cost!
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Don’t think I’m some super achiever, because all these pitfalls is what I do every day 
The few times I respect these guidelines, my days go from average to great.