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Perform well in a single match and perform well through a long season is very different and with latest seasons, we have enough evidence that Manchester United failed to maintain their performances well throughout a long season. They had some great weeks or months but at the end of season, they failed to achieve their target at beginning of season.
Europa League has many matches, not only one match and Manchester United can be affected by their matches in Premier League too. They can not improve and only play like previous seasons, they actually lack of ability to win Europa League even Bayer Leverkusen will no longer be there.
Overall, Manchester United performance was very poor throughout last season, although Ten Hag managed to win the FA Cup Trophy from Manchester City, but in my opinion it was just luck because the match was a single leg. Manchester United failed to compete with other teams in the EPL last season, so they had to finish outside the European Zone, they qualified for the Europa League through a special route after winning the FA Cup. Manchester United must be ready to compete with other teams in the Europa League because there are many surprises here due to the team's motivation to continue to survive in this competition. The poor performance last season must be improved immediately, Manchester United also has problems with its players who are very susceptible to injury, so Ten Hag must prepare a solution if something bad happens to his squad.