He needs to go back to attack, Lost a step but it's not the main reason for the less goal production (besides injury and struggling with form for a while). He is super creative but he has a Rooney syndrom right now, he thinks he is a full on midfielder, amount of times he is in front of busquetz making through balls increased alot (defenitely spends alot of time being in Pirlo like zones). He used to interchange between coming deep and blitzing forward, but now focuses too much on former and leaves too much of the central penetration to Suarez. It's most evident in games Vs settled defences. Games they use counters mostly is where he gotten his goals.
This second half is an exception, he actually tries to go forward more right now instead of just being AM.