Marseille have done a good work so far. Especially after changing their manager they have been on the rise. We are witnessing its reflections in the Europa League as well. Their performance against Villarreal was really impressive especially in the home game. The Benfica matchup might be a little more difficult but I'm still favouring Marseille to advance. 
If Marseille make it to the semi finals I don't feel like they will see more than that phase.
Because their quite probable opponent would be Liverpool there and I wouldn't expect Marseille to eliminate Liverpool too. But at least there is good progress in their game since the latest manager change.
Marseille's hard effort work deserves appreciation, they were able to reach the quarter-finals by beating Villareal and now they have to face the next challenge against Benfiqa. I think Marseille is in high self-confidence at the moment so he will probably get rid of Benfiqa even though it's not easy for Marseille he will try his best may do their best in the European league to reach the semi-finals. Sometimes ordinary teams like Marseille can give a surprise in the European League even though they are not the favorites.If Marseille make it to the semi finals I don't feel like they will see more than that phase.
Because their quite probable opponent would be Liverpool there and I wouldn't expect Marseille to eliminate Liverpool too. But at least there is good progress in their game since the latest manager change.We don't know yet who will advance to the semi-finals but what is clear is that one of them will face Liverpool, which is a strong team in the EPL. Currently, it is a big challenge for any team that faces Liverpool or Leverkusen in this competition because they are in a good trend. in the domestic league.