I meant to reply sooner, but the afternoon got away from me and then I completely forgot until I saw your note again.
I did try that little routine we talked about, and it helped more than I expected once I stopped overthinking it.
First I just cleared the desk, opened the window, and gave myself ten quiet minutes without hopping between tasks.
That seemed to reset things a bit.
After that, I made a short list with only three things on it and finished one before touching anything else.
It sounds obvious, but it kept me from drifting.
I also took a walk around the block before dinner, which helped me shake off that stale, stuck feeling.
If you want, I can send the exact order I used because I think that was the main reason it clicked this time.
Nothing magical, just a cleaner rhythm and fewer distractions while I was trying to focus.

I ended up taking your suggestion and trying the simpler version first instead of jumping into a huge plan all at once.
That made it easier to stick with, and somehow it felt less annoying because I did not turn it into a chore.
I spent most of the morning rearranging a few things, then made coffee and finally sat down without checking messages every couple of minutes.
By lunchtime I had made more progress than I expected.
The funny part is that none of it was dramatic.
I just stopped trying to perfect every detail before starting.
Later on, I put on a playlist I had forgotten about and that helped keep the room calm and quiet.
If you are still thinking about doing the same, I would say start smaller than you think makes sense and leave a little space to adjust once you begin.
That part helped me more than any other little trick.