Yeah to the thing with own folders for each project.
Without attacking the OP, some things come just from lacking organization, as I am guilty of this myself.
The “problem” will usually be laziness for me. While I am just a hobbyist, having fun with Cubase, and not making a living off it, yet not putting out enough full songs to climb from bad to not-so-bad production slowly, even doing sketches is bad if you all throw in everytine into one place. Just hitting Create on the hub every time you fire up Cubase is just not the way to go,
If I toy around with orchestration VSTs for instance, I (rarely) might have a spark of creativity and decide to work on something. But try find the right folder quickly now: Was it in one of the folders “Arps Test”, “asdf” or “Unnamed folder 3”? Why didn’t I name it properly the first time; and could have rendered that demo’ed plugin to audio BEFORE the trial period expired as well …
Plus when trying to clean up your old projects it takes forever to find out which file lies where, even with the Pool windows which shows files shared across projects on the computer.
The only thing really helps to force yourself to things right at start. Every time.