[....]
moreover, if Ten Hag is given the freedom to bring in the players he needs. so, we will see the difference that will be displayed by The Red Devils in the next season.
That's never going to happen so let's operate in reality here. Bringing the players that he needs is not just up to his "freedom". We all know that there is a lot of competition in the market and other big teams would most likely bid for those players that he wants. Another constraint is that he cannot simply throw more millions just so he could outbid others.
Basically, Erik ten Hag was able to form a good squad so that Manchester United had a good performance but unfortunately, Erik ten Hag still couldn't maintain this good performance consistently throughout the season or until the end of the season. But yes, if for example Erik ten Hag is not given the freedom to acquire or bring in new players I am sure that Erik ten Hag can still produce good results. But yes, if it's to win the Premier League title or to go further in the Champions League next season, I personally feel that Manchester United still haven't been able to achieve that success.