If you have that many NAs then I bet
(1) There are things in there that are staying and festering because they are not really Next Actions. Do the taste test: if you put the end of your pencil down on your list for the context where you are, do you feel good about immediately doing the action it lands on? If not it is not an NA. You need to go through and sharpen them.
(2) There are things in there which you would like to do, but do not have the bandwidth for. That requires the discipline of making a decision that "getting face time with the folks in sales", "learning the violin" etc should be on your someday maybe list.
Both of the above are things that I have to do structurally in the weekly review: I often find actions that I just don't seem to be getting done are ones that I have either failed to boil down to the real next doable movement OR that I have subconciously put them on the back-burner.
The purpose of the weekly review is to keep your lists transparent, attractive and representative: give yourself the gift...