The only best idea to recruit the new coach. This is the only possible thing to be done by united. I don't even see other possible solution to improve manchester united to be even better.
MU needs to get a new coach that has brilliant idea like mourinho which had given united an europa league trophy in the past. Mu doesn't need a problematic coach like ten hag.
Sorry, but what the hell are you talking about?
You say that they don't need a problematic coach and at the same time, you suggest Mourinho as replacements. Is there a more problematic and eccentric manager than him? And a few years ago they already tried with Mou and he was not fired exclusively because of bad results, but also because he created a very toxic atmosphere around him.
Otherwise, they must first get rid of all mediocrity from the players, and only then think about changing the manager if necessary.
Ten Hag needs to be replaced. He had problems with some of the players in last season like Cristiano Ronaldo. Ten Hag did not play Ronaldo regularly who was one of the top scorers in the season before Ten Hag came to Manchester.
Another Problem with Manchester United squad is that player's performance deteriorates as soon as they join the club. Onana was an amazing Goalkeeper but he has been mediocre at best this season. Although Ten Hag managed to win the coach of the month in the premier league, their performance in UCL has been lackluster. They placed 4th in a group where there were teams like Copenhagen and Galatasaray. They could not even be managed to qualify for the European league. I don't see any solution for Manchester United other than sacking Ten Hag and getting a new coach who could perform with the current squad.