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Honestly speaking, I also do not see Manchester United improving very well in next season. I still see Manchester United struggling to make top four next season. They can only avert this if they make good decisions. Decisions such as hiring a new coach, buying good and consistent players. In fact buying quality players to man the defense is more important than hiring a new coach. Even if I do not have a complete confidence in the personality of Erik Ten Hang, I still believe that he can do better next season if provided with consistent players. He was able to win the FA Cup because he had a handful of his players available for that final. Can you imagine Manchester United defense without Martinez, Varane, Wambissaka and Dalot winning the FA cup finals?
However, I still understand that a whole lot of things happen in new seasons. The pre-season a new thing, the swapping of jersey, selling of players and buying new legs. All these bring about positive changes in a club, but it is still the head coach that will pilot the team. He'll receive the major accolades or criticism according to the results.
Adding several new players to the squad next season is certainly very welcome, but still I don't give Ten Hag too much confidence and hope to bring a lot of success to Manchester United next season. I can't expect much from him, but Ten Hag is one of the great coaches who this season successfully beat the defending champions in the FA Cup.
Winning the FA Cup has taken Manchester United through to the European League. It has been a consideration to keep Ten Hag as coach and give him a chance, but you are certainly right that the team needs some fresh legs especially in defence. Some old players have to be sold, especially those who simply fail to compete and give their best.