When someone has too much clutter, they need to consider why they keep so much stuff when it bothers them.
Usually, the clutter is protecting them from something. It may be keeping them from having to make decisions. As long as you ignore all your clutter, you don’t have to decide what to do with it all. Many people with too much clutter are also perfectionists; they think that their stuff needs to go to just the right places. The thought of making all those decisions of where to send each thing becomes overwhelming, so it’s easier to just postpone the whole effort and keep tripping on the clutter.
Another thought: your clutter might be a distraction from yourself. If you didn’t have all these someday projects lying around, you might have to focus on yourself and your life instead of all that other stuff waiting for you to do something with it.
Or perhaps the clutter serves as a buffer between you and the outside world. You keep people out because you don’t want them to see what a mess you live in. It’s a handy dandy excuse for not having people over.
There may be other reasons, but one thing is for sure: the clutter is serving some kind of purpose for you. Otherwise you would get rid of it, since it bothers you. Figure out why you keep it, and you’ll be one step closer to getting rid of it.