If he can't improve the club's performance, I think next season will be the last season for Erik Ten Hag. The club also has to think about a suitable coach to train the club in conditions like this. It's not even easy to appoint a great coach to manage the club if the club is in such a condition. it's not good and the coach will definitely think long and hard about coaching a big club, worried that it won't live up to the fans' expectations.
He can not still improve the teams performance unless he will be giving full control of the transfer window so he can sell all the players that are not ready to play for Manchester United. They have a lot of players that are only seeing playing privileges that they should not be enjoying. They have not being good for the past few seasons yet they are still be paid enormous salary and still a part of the team which makes it difficult for the manager to request for new players when they still have the old players that are getting paid. Erik Ten Hag needs to be more strict if he wants to keep his job after next season because he can not be friendly with this set of players when they are not playing for the manager but playing anyhow they like because they still get paycheck.