It will be difficult for them to achieve the same results.They did not perform well in the Bundesliga mainly because their primary focus was on the Europa League after seeing that they could not fight in the Bundesliga for a place in European competitions for next year.Now they won this Europa League, a fully deserved trophy for them and a sure thing is they need to perform better as the teams in the Champions League are much stronger than those in Europa League.
This is undeniable. I'm sure they won't even be able to repeat winning the Europa League (if they take third place in the Champions League group stage and get there again). Such beautiful fairy tales happen to small clubs very rarely. Next season in the Europa League there will again be many strong clubs (for example United ) and it will be very difficult to beat them.