Selling the players they currently have when their performance is declining will be a big loss for Manchester United, because the value of their players will also decrease. But keeping them is also not the right solution, Man United clearly needs a refresh in their squad. So whether they like it or not, Man United must sell their players at a loss and spend their money again to be able to recruit new players who are more promising.
Manchester United's current situation is very chaotic, because with their drastic decline in performance, their players' prices have also decreased. So this will certainly make Manchester United very confused, because basically as you said Manchester United needs new players or refreshment, so that next season they are not like the previous season, which finished in 15th place in the Premier League. This is really embarrassing for a team like Manchester United. So with this, Manchester United must be willing to sacrifice money again now to improve their team's performance. And I think Manchester United really should focus on the results of their player sales. Because, until now I have not heard any of their main players being sold. So, Manchester United should act quickly for that, so they can get fresh funds as soon as possible.
Although according to the news circulating, some Manchester United players really want to leave. These players are Jadon Sancho, Antony, Rasphord, and including Garnacho. But it seems that Manchester United has not given an answer to these players. In fact, Manchester United actually brought in a new player, Matheus Cunha. So with that, I don't know what Manchester United's management is thinking. They should have allowed the players who asked to leave so that Manchester United could at least get fresh funds to get new players again. But apparently Manchester United did not think about that, so we'll just have to see what happens with Manchester United.