It was unfortunately that Leverkusen did not win Europa finals but that did not stop them from having a remarkable season. They were much successful last season than any other season because they won Bundesliga unbeaten. No one expected Atalanta to be the winner of last season Europa because they were underestimated.
I believe that next season Atalanta will try their best in Champions league and same with Leverkusen but I don't know if they can go far, because champions league is not the same with Europa, and in the previous seasons, Europa champions don't go far in UCL.
Bayern Leverkusen and Atalanta will participants in Champion League next season and both team will make surprise with their perform after success breaking out any record in Europe League.
Bayern Leverkusen success become the Europe League have many unbeaten matches before defeating by Atalanta in the final, in other side Atalanta as not favorite team success eliminating top team from Liverpool until Bayern Leverkusen for winning their first Europe League trophy.
I think next season have any surprise team will make us shock with their performance in Europe League, but difficult to see the unbeaten matches record will break for next season after Bayern Leverkusen success keep unbeaten reached until 12 matches since phase round until semifinal match.