For a team that is in a slump to be able to get a place in the top 4 of the standings is a good achievement in my opinion, especially this is Erik Ten Hag's first season in charge of Manchester United. With what they have shown this season, it is a belief that maybe they will continue in the next season or even be even better in the previous season. Erik Ten Hag has the potential to do just that.
I don't agree if you say Manchester United is in a slump, logically how can a team that is in a slump be able to finish in the top four. Since Ten Hag arrival, Manchester United immediately recovered from their slump, their appearance was much better than before. Finishing in 3rd place with a collection of 75 points is a good achievement achieved by Manchester United this season, Ten Hag managed to make Manchester United compete again at the top of the standings.
Next season Manchester United will add to the strength of its squad to be able to compete in the UCL, while in the EPL they must appear consistent because the competition for the top positions is increasingly competitive.