There are teams who do terrible compared to what is expected of them, so they should be happy if they do enough to be where they are expected, which would be top four at the best case. Meaning, if they finish fourth then they should be happy. Will this work or happen and like see the end of the season? I do not know, but I know that they are not going to be all that great at all.
Meanwhile, De Zerbi was given the task of bringing Marsielle to a top four finish in the standings, where this season they ended in 8th place in the standings, outside the European zone. Maybe winning another domestic trophy, apart from Ligue 1, is a target to achieve like the French Super Cup. In terms of experience, De Zerbi can certainly lead Marseille to the Champions League zone next season, provided he gets adequate budget support to build squad depth.