Liverpool have some big decisions to make over a handful of key players this summer. The Reds are looking forward to a new era under Arne Slot, but it’s clear that not everyone will make it with the Dutchman in the dugout. If Liverpool are to make the next step and become genuine challengers under Slot, they are going to have to improve. One way of doing that is by selling underperforming players, and bringing better ones in. There’s little question that the Liverpool squad could still be upgraded. Part of the Reds’ issue last year was a lack of true goal-scoring threat in their forward line. …