He's a weird player for sure. His proper position is becoming blurrier and blurrier by the game it seems.
It seems he's best out wide but has no work rate to track back and keep shape.
His size and strength helps him up top to hold the ball up, but lacks finishing that a target man needs.
And he can create from outside the box but doesn't have the speed or agility to properly link up play from behind a target man. He is useless with the ball in midfield. Too slow to switch or spread play and rejoin the attack quickly.
In other words, it is becoming harder to hide his deficiencies.
Very soon, and possibly already (if you consider ideal lineups), he'll be a player that can only play in certain games vs. certain opponents. Otherwise, he will be a sub or someone used for creativity late in games.
But I still would be hesitant to sell unless a great offer comes because he does have somewhat unique abilities that can always be useful.