I did a brief stint as fully remote (~3 months) so I never got fully into it, but these are all fantastic points, many of which I did to great effect.
One additional routine I found most helpful was to have a "going to the office" routine. After my normal at-home morning routine, I would leave the house and go to a nearby coffee shop for some coffee, then return home to work. That was my "commute". Before it I was at home, after it I was working. When I was done working for the day, I'd leave the house, take a short walk, and go back home. It really sounds silly, but having those "commutes" really helped separate work time from home time, even if they were in the same space. It helped that it was over the summer so the weather was beautiful.
One additional routine I found most helpful was to have a "going to the office" routine. After my normal at-home morning routine, I would leave the house and go to a nearby coffee shop for some coffee, then return home to work. That was my "commute". Before it I was at home, after it I was working. When I was done working for the day, I'd leave the house, take a short walk, and go back home. It really sounds silly, but having those "commutes" really helped separate work time from home time, even if they were in the same space. It helped that it was over the summer so the weather was beautiful.