If your unfinished projects are adding up there are generally two approaches to solving them.
One – Close them off so you don’t see them anymore.
Two – Stop starting new projects until you finish the old ones.
Both options involve some work in look at the old projects. But you haven’t been working on them at all, so that is why they are “old” projects in the first place, going back to them will just remind you of what they are and that you didn’t finish them.
The third option, is to accept them for what they are, ideas you tried out that didn’t work, chalk them up to great learning experiences and move on, never looking back at them or worrying about them.