He was lucky because he was still given the opportunity by Manchester United, even though their performance this season was not at all satisfactory. In next season he should be able to improve again, but personally I doubt that he will be able to bring Manchester United even better. Although I also don't rule out the possibility that they will be better, for now I still doubt it.
He still has a lot to improve in the game that they often show, because there are so many problems that I see. The chemistry between the players is also not good, he has not been able to create that.
If he was at Chelsea, Erik Ten Hak might have been on the verge of being fired when he had such a bad season like last season. He is lucky enough to still be maintained even though if you look at Man United's inconsistent performance due to the many players who are injured. I think the problem is with the players because from last season we could see the level of selfishness shown by some of the players he has.
In addition to Chemistry, Erik Ten Hak also often tries different strategies in every match and always puts players in the wrong position. I don't understand what he is looking for, but if you pay attention, he has not found a form of play that suits his players.