The second season for ten Hag will be decisive - it will no longer be possible to blame everything on his predecessors or on Ronaldo. Although I support United, I think next season will be worse than this one - just at least due to the fact that Liverpool and Chelsea will return to business (presumably) and in such conditions even getting into the top 4 will be a very difficult task.
In this season when we saw the game between Manchester United and Liverpool and Ten Hag lost with bad results I saw him doing the best he can do, Ten Hag punished players by making the player watch Liverpool celebrating which can be a good shock for the player to have better performance.
I don't think Manchester United will do worse in next season. I mean they started this season horribly and lost a lot of games. It was a shocking start for everyone. Ten Hag after few games was able to limit the damage and started making the team win again. He failed to let them be the first, that's obvious but next season they need to get some players to make the team better especially fixing well the defence line and preferably get ride of their "best" defenders for the sake of success.