If we look at Barcelona's performance since the start of last season, we can see that Xavi is actually a good coach, he has a good leadership spirit, it's just that the competition with Madrid is very tight, Madrid has more of a winning mentality than Barcelona, regarding whether Flick will be able to bringing Barcelona to be the last in La Liga, I also doubt it, just being able to finish in the top 2 would be a good achievement for Flick.
I agree that Xavi has given his best for Barcelona and is a coach who can be relied on in the strategies applied to his squad. Even though at that time Barcelona was in poor condition in terms of performance regarding player problems, Xavi was able to overcome it and is now in second place in the standings. If you say you have a winning mentality, Barcelona has a really good history, just like Real Madrid, maybe it's just that Barcelona has financial problems so Xavi can't buy the players he hopes for. In my opinion, this is what makes Barcelona unable to compete with Real Madrid this season. Regarding Flick, if he does take over Barcelona, there are several things to consider. Flick is an experienced coach with a solid track record, especially during his tenure at Bayern Munich. Nonetheless, adapting to La Liga and Barcelona's style of play may require a lot of time and effort. Finishing in the top 2 can be said to be a good achievement considering the tight competition in La Liga.