I worked on solo rules for my own game, and one thing I struggled on early on when playing solo was the question of how much I should log/record of my game, so I included the following advice in the Pine Shallows Solo rules:
Solo tip: keeping records of your adventures
You can keep track of game progress in different ways. At the very least it's helpful to make notes of any active (Story) clocks, visited locations, Supporting Cast Members you've met, your current character stats, etc.
Some people will journal their complete game, others will keep just some minimal notes. Some people will record audio or even video while playing, others will play entirely in their heads, there is no wrong way! If you're new to solo roleplaying, take some time to try out different levels of detail while taking notes.
This would have helped me a lot when I started out.
What advice would you have liked to get?