Arsenal have twice taken the lead and still failed to win. Mentally, they seem to have finished the league in their heads. Second place is safe for now. There's a six-point gap with Manchester City. Liverpool can start the official celebrations early. I think Arsenal should now put all their focus on winning the Champions League. They have an opportunity after many years. They didn't win the Premier League but they have only 3 games to win this trophy. They have to push it to the limit when they are so close.
Since Arsenal has gathered enough points that will allow them to qualify for next season's UEFA Champions League competition, I think Arsenal is very much okay with any result they get in their remaining Premier League matches so that they will be fully ready to face Paris Saint-Germain in the UEFA Champions League. Liverpool will soon be crowned the Premier League champion, and there's no need for Arsenal to take their remaining Premier League matches seriously because even if they win their remaining matches, they won't win the Premier League title. I also agree with you that Arsenal should focus on winning the UEFA Champions League trophy because if they miss this opportunity, it will be difficult for Arsenal to come this far in the UEFA Champions League competition in the coming years.
Of course Liverpool will soon be the Premier League champion, while Arsenal wants at least to advance to the Champions League final because we can see that they are making every effort. Since they have taken a respectable victory against Real Madrid, they may be able to achieve that honor in the Champions League semifinals. Maybe it is your wrong sentence that there is no need to take the rest of the rest of Arsenal's Premier League matches. They will not be champions of the Premier League is right at this stage but so they will stop the effort. I think if Arsenal performs badly in the Premier League now, their morale may be broken. Arsenal's victory at the Emirate Stadium today was shared but their dominance in this match was huge.