Barcelona and Xavi are aiming to win the La Liga title and the Europa League title. On the other hand, Ten Hag and Manchester United's main goals are to qualify for the Champions League and the Europa League title. Arsenal will also continue to fight for the Europa League title. It is difficult to predict which team will win the title. But every team has a good instinct to win the title. United and Barcelona's performances have been somewhat unstable, but both have strong squads. But both the teams have enough time to organize themselves and strengthen the team.
In fact, it is very difficult to say now what priorities Arsenal, Manchester United and Barcelona will have in the EL. It is possible that Arsenal and Barcelona will have to focus on their championships and since I think that they have already secured a place in the Champions League for next season, the EL may not be their main priority tournament, and they may sacrifice it if the situation requires it.