He's had a bad few months, really struggling from the upheaval the team's been through.
He had a great partnership with Silva on the left which gave him good regular service and balls behind the defence. He also had a good thing working with Zinchenko at LB. Both of those have gone, now he's being asked to play up front vs 3 centre backs, he's not getting involved in the game much, and he's not the kind of player who can disappear for 10 minutes and then make the telling contribution...he needs to be involved constantly.
Despite all that no one in the league has scored more than him in the last 12 months.
I'm sure his form and goals will return when the side settles down, Pep figures out the midfield and he's got a fit striker in the middle.