Pulling at loose threads

How many loose ends does your campaign have trailing behind the PCs? I have only been running my face to face game for a few years now, playing maybe 40 hrs a year or so and yet already there is a trail of loose ends, uncompleted quests and unsolved mysteries.

I have intentionally set up two concurrent story arcs. The point of having two is that I don’t want the campaign to feel linear or railroaded. One plot often interferes with progress in the other and the inter-weaved stories are richer and more complicated than a single story.