I have a similar document, that I use to plan pretty much everything from personal projects, to shopping lists, to restaurants I want to try out, etc. I found google docs to be pretty unmaintainable, and have settled on using https://workflowy.com/ for this as a hierarchical bullet point style TODO/Notes lists. I'd highly recommend it to anyone else like myself who have tried 20 different TODO list applications but have never settled on a good solution