Flick has a tough task at Barcelona. High expectations from management and fans will put him in a depressed condition. Another major concern regarding Barcelona's financial condition that made Xavi fired will make it possible to be in the limited transfer of new players.
In next season's matches, they will have stronger opponents. But Flick and the management do not seem to have a new player transfer policy yet. Maybe there will still be many new surprises. Flick's task in the match will begin in July. They will go to the United States for pre-season. Their first opponent is Man City in Orlando on July 30.
Because Barcelona is a big club so high expectations do not only come from management but also from Barcelona fans as you said. At least the La Liga title is a target that he must achieve, while if the UCL trophy does not materialize, it is understandable considering that Xavi as the previous coach also could not do much in the highest European level competition.
Every season there is always fierce competition because all teams have prepared everything carefully from the start. I'm sure Flick can overcome his biggest challenge as head coach of Barcelona.