Manchester United also need to improve before other teams at the top of the table set a big gap between them
Manchester united just needs to fix the problem on its defensive line. I don't even see another problem occured in manchester united. It was equal to the arsenal but the defensive lines must be the main problem for manchester united.
Manchester united doesn't have a lot of defenders at this moment as some of them were injured.
This year, Manchester United brought in quite a few recruits. Recruits are unfamiliar with Erik ten Hag's journey. They couldn't find a bridge to bring them together. Look at their attackers trying to find a goal. It was so luxurious that they missed many scoring opportunities. Goals are the motivation for the whole team to work hard.
Defensively, I would say things have gotten better. When Harry Maguire and De Gea. are missing from the list of starting players. If the situation of the whole team does not improve, it will be easy to receive heavy defeats against big teams.