> but I find that my visual focus is easily lost when I read my own work
I have the same experience on your linked post.
For me, running Safari on MacOS Sonoma 14.2.1 at 100% on a MacBook Air 15:
The font isn't optimal to my eyes. The strokes are too thick for the size and the space between the letters is too close (kerning). This makes the letters and words run together unless I pay close attention. That's tiring, especially when the window is the width of the full screen, so I lose focus.
To compare this, split your screen vertically with your test post on one side and a site you like on the other.
One thing that leaps out to me is that, at half-screen width, it's easier to read your site. The letters are still too close together and the font strokes too thick, but the shorter line length makes it less tiring to read each individual line.
Hope that helps some. A quick way to play with this is to pull the text into Word / LibreOffice / etc, where it's easier to play with fonts, kerning, line spacing, etc.
