Just a general observation as someone nearing 50. I'm honestly very curious to see if someone has had a different experience than me. I'm am, to put it mildly, not an "organized person". I have tried a million different systems throughout my life - GTD, Inbox Zero, spreadsheets, etc. etc.
To be honest, I don't believe that any of these "organization systems" really help people that have problems being organized in the first place. I think it's just a fundamentally different way of how I'm wired. My general conclusion is that trying to "fight" my natural way of doing things is always going to be a losing battle, and that instead I just need to figure out ways to handle my general messiness and get it to work for me. I mean, I can certainly be organized for sizable stretches of time, but whenever I start getting pressed for time, or stressed, or lose my motivation for some other reason, it always reverts to the mean.
I'd honestly be really interested to hear if anyone has ever changed from being a "unorganized person" to an "organized person", because it my few decades of life I've never seen it be successfully accomplished.