I don't think that Sevilla is happy with the result, because losing 2 points in the last minutes is always unpleasant even if you are playing in the minority. Probably the team will prepare for the game against United in a not-very-good mood (in addition to the fact that there are few positive expectations from the game against United initially).
If United don't fall into a functional hole because of their hectic schedule, they will tear Sevilla to shreds. United have dealt with the stronger Spanish teams and Sevilla will be an easy target for them. I do not think that the Sevilla players themselves have any illusions about this. The most adequate thing they can do is to concentrate on La Liga. For example, if they had won yesterday, they would have been only 3 points away from the Euro Cup zone, even for a day.
Manchester United's performance in the Premier League a few weeks ago saw a decline but in the last two matches I saw them recovering and returning to their best form.
and against Sevilla I am still the favorite for Manchester United to win and advance to the next round and even I think Manchester United is the team with the greatest chance of winning the Europe League this season.