Have you tried going for a 20 min walk or something like that after work? I have a dog so I find that taking him out after helps with this.

This is not a need that all of of us have. Nor is a commute an effective way for all of us to disconnect from work. It very much depends on both the person and workplace in question. Where it apparently is a serious need for you, I'd second some of the other suggestions on finding your own replacement, maybe something along the lines of set an alarm for end of day, turn everything off, and get out of the house and walk/bike.

I don't feel that way at all. Yesterday I dismissed one person who wanted me to "take a quick look" by saying that my work day ends in 10 minutes so I won't be able to help much, then after these 10 minutes I closed down my work laptop and enjoyed the rest of my evening without thinking about work once. The problem exists solely in your head.