I highlight the front line because they don't have a centre-forward and so far have place Marcus Rasford and Anthony Martial ineffective and even though Anthony Martial is a centre-forward however his performance was below the level required by Manchester United. On the other hand, we may also see that in the previous three matches the performance of the midfield and defenders has also been inconsistent so far, so Ten Hak must immediately find a solution to this problem.
Calm down buddy, we already have a wonder kid named Hojlund, Manchester United will able to win streaks when Hojlund recovered from injury 
If there's no change after Hojlund is playing, then it's the time to bully him and Ten Hag need to find other striker. I feel Hojlund would be like Nunez where he's can't perform in the first season, but after then he can improve in the next season. I hope Hojlund isn't same as Mudryk lol.