You can't play through a player. He should be trying to get in front of the defenders more, not behind.
He's usually the furthest up front leading the line wedged between two centre backs. There isn't any more room to run in behind other than getting into offside positions because we don't play through the midfield. The majority of our attacks come from breaks in play, are in transition or down the channels. Therefore you are asking Bruno, Garnacho, Rashford and Antony to play 20-40 yard through balls from the channels/deep midfield hoping it gets past the defenders, into Hojlund's feet and out of the reach of the opposition keeper.
That's not happening and the only way we can consistently build up attacks is to play into him for lay offs and one-twos. Garnacho is a one-man take-on machine. He will go past a player once and lose the ball equally. Antony is usually conservative with his possession and relies on interplay with Bruno/Dalot but will rarely beat his player and cross/cutback. Bruno plays 100mph and is all over the pitch.
Hojlund is doing his best to link play and be a focal point so others can get their possession and get on the ball because if he doesn't, then he'll be just another greedy cnut. He's far from perfect and I agree some of his runs are not in the best lines so he doesn't help himself but my god is he getting so little service or help from his teammates.
He might make 5 good runs and 5 bad runs but he will probably only receive it 2 times out of those 10. The biggest issue lays there.