If Erik Ten Hag is able to successfully win the FA cup and Carabao Cup that is huge success for the club because as they say “one big journey begins with just a step”. If Erik Ten Hag is capable of achieving that he can be trusted with the task of achieving even more with time. Right now, the main focus should be reviving the team and maintaining consistency this season.
Eric Ten Hag isn't the best coach for Manchester United and not a bad one either. He might be able to maintain Manchester United in one of the spots dedicated for UEFA competitions or he can progress with the team in a side competition like FA Cup but definitely it will be hard for him and his team to win other competitions especially EPL.