I am going to try a few other OSR publications for solo gaming. My next is probably Maze Rats by Ben Milton. But this one looks cool, too.
I am still reading “Solo GM Guide.” I also downloaded Solo_Roleplayer_-_The_Collected_Archives.pdf, which I plan to read, too.
There’s also a bunch of books by Better Games. @dmfred knows the authors and has been on some of the streams playing and testing some of the different rulesets. I have some of their stuff on my backlog that I need to get read.