Mentality was not only Manchester United's problem. They also have tactical and decision-making problems. And look at their positioning against Tottenham above. Nearly all their players are in one patch of the pitch. This proves how they're having tactical problems on their side. Their forward looked too high. Their three midfielders are also occupying the same space. It makes their midfield hard to reach their forward. No doubt their attacker rarely get the ball. It makes them difficult to score.
I think Manchester United's problem is their tactical problem. Manchester United have a lot of talented players in their squad. And most of the players were bought by Manchester United management at high prices. But no player is able to play well with Manchester United consistently. The performance of Manchester United players is very erratic. Suddenly they surprise everyone with a great performance. But this team cannot continue the winning streak. Manchester United should look for an experienced coach. It is impossible to improve this squad with Ten Hag. Ten Hag failed despite ample time and opportunity.