In the last two seasons, there have always been unexpected surprises in the Europa League, including what happened last season where Atalanta surprisingly managed to become champions in the Europa League and were also able to beat Liverpool and Bayer Leverkusen, who were favorites to win last season. And for next season I also think there will be even more surprises that will happen to the teams that are not favorites to win the championship. Because teams that are not favorites to become champions and are not discussed much by the media will continue to improve their performance to be able to beat all the favorite teams.
Interestingly in recent years no team have consistently won the Europa several times in a row, the fact that the Europa keeps coming with surprises especially with who turns out to be the champions is one thing that keeps it really lively and interesting, the Europa is now even more competitive then some of the domestic leagues in Europe, defeating Liverpool and Leverkusen by Atlanta happens to be one of the highlights of the champions league last season.
It is difficult for a team to win consecutive championship titles, because the opponents they face are good teams representing their respective domestic leagues. The ups and downs in a team's performance are also a factor that ultimately makes them fail. There are many teams that perform well in the domestic league, but when they compete in the European League they display a game that is not their usual level. This is something we see often.
The European League is the second league after the Champions League, so teams that don't have a big chance in the Champions League will try hard to get in the European League. They might have been very successful in the European League, but in the Champions League they failed miserably and even had to be eliminated from the group phase. This is where the situation is different because the level of competition is also very different.