The longshots were a very nasty knock on from the dribblers. Also off the ball movement can be improved, its all a knock on from issues in decision making. The problem isn't really number of longshots, but why they take the long shot in the first place.
I think they missed it in the rush to get it out before Christmas, so i hope they take a longer time over it. But you can still also minimise it, the issue is much worse if you are not creating space and avenues to attack for your players, so even if the issues are sorted, if people are not doing this in their approach they will still see excess shots.
I would say its about 75% ME 25% tactical. You can minimise through well crafted approaches, but there will time times when there is nothing you can do until the issue is sorted