Earlier quoted context omitted.
you might want to try Notion or Evernote something like that; externalised memory is generally served by note-taking apps. Roam is also good, if you don't like organising your notes hierarchically. Remembering to use it is not an issue of memory, but of habituation; there are decent habit-tracking apps like habitica to help with that. Of course, the first habit you'll want to build is the habit of using a habit track…
My phone says I have 219 notes, many of which are pages long. I need a better way to organize them, especially when I need to add something. Large flat files of text get difficult to use. Maybe the apps you mentioned address that in some way, I'll have to look.
219 notes though, sounds like you already have a good habit of capturing your thoughts! Organizing tasks into current contexts has helped me a lot (At Computer, Housework, Wife,...). Best of luck!