I also see Arsenal as a team that can still be quite strong next season so that some of their closest rivals last season also still have to be wary of Arsenal as their competitor in the race for the Premier League trophy. Likewise in the Champions League because Arsenal could perform better next season and be able to reach a quite crucial stage so that their rivals will still see Arsenal as an opponent that needs to be eliminated early before heading to the quite crucial stages in the Champions League.
This competition, the Champions League, is very tough, teams who thought they were strong were unable to survive the season and the cup.
Only teams that have an excellent turnover and a well-designed and organized team can manage to make a difference, in my opinion. Then maybe I'm wrong.