I don't remember Arsenal having any good success in the Champions League. Almost 20 years ago they played in the final against Barcelona and lost. Then a few years ago they played in the Europa League final against Chelsea and lost too. The younger the squad, the less experienced they are. So it seems to me that they will fail again this season.
I remember very well the time in the champions league final against Barcelona, but with the state of Barcelona, which was so feared by all of Europe at that time, Arsenal could not beat them. I don't think Arsenal will likely get any further than the last 16 and even so they should at least prove that what we criticize them is not true. Even if Arsenal try, they will always fail when they meet teams from other leagues such as Real Madrid, Milan, or even PSG. In addition, if Arsenal meet Manchester City in the preliminary round, it is certain that they will return home early.
Unfortunately, when they are in a very good state, there are teams that are better than them and make them repeatedly difficult. Last season too for example in the Premier League, they were good but there was another team better than them, Mamchester City. They should have become champions, if only there was no Mamchester City.
Next season they are predicted to be better prepared for the season, be it in the local league or here, but also do not let them be lulled by the praise, because if they swallow it raw then it will make the situation reverse.
What they felt last season should be a pill that will make them even more prepared.
It seems that Arsenal are not entirely lucky with the time available and they always face difficult opponents to beat. In the domestic league competition last season they were almost able to win the title they had been longing for but indeed the euphoria of all the players and even the coaches was out of control and they were not ready for the successive failures that left Arsenal far behind Manchester City.
Whatever Arsenal do they will still struggle even for the champions league though. It's like they don't have a strong identity that allows them to become the flagship champion for the champion's league competition and therefore they will still be in the same phase before they can achieve that.