MU needs a better striker as well as hojlund was utterly scam transfer. He performs well in UCL but mU will out from UCL too. He has 0 goals from 10 matches in EPl. The worst striker.
I don't think they will sign anyone, but I hope it won't be a similar case to Martial, who has been at United for 7 years! 65mln EUR and no progress, what a really shit. I think the real despair was the loan of Weghorst for half a year, who didn't even have a place in 11 the middle team of table in Bundesliga. 60mln for Fred was in the mud for me, Casemiro and varane, both 110mln think so is not perfect also but 100mln for Antony is real crime.
You are bringing up Martial, but he scored 56 goals in 175 appearances, that is why I think he is not the worst transfer they ever made. But you are right that they made several transfers which were absolute garbage with respect to the return on investment and sometimes they didn't get a real chance to play at all. Mason Mount or Sancho also having infinite trouble with ten Hag.
I think they won't be holding back when there is a possibility to sign a good player, but what will it be good for? They need someone who understands how to bring in new players and make the team stronger. If they don't have someone who understands that, new players are not the solution to a different problem.