You have to see that currently, Man United is in 4th position and if you are still not convinced, in the previous 5 games Man United has improved in beating the opponent. From 5 matches including FA Cup with Aston Villa in 3rd Round, 4 wins by narrow score, and 1 draw against Aston Villa in Premier League. So far I think Man United made a few moves although not as significant as possible.
I understand that, Man United need an adjustment process with Rangnick. I think whoever the coach is they need adaptation. That adaptation has been a long way off and now Man United have played like Rangnick's will. The movement of seizing the ball is very visible, they simultaneously presing on the opposing player. At least a few wins have given Man United the chance to keep going to ucl next season. "I think at the moment Man United is still unstable.